Monday, June 23, 2014

MCQs : SET # 15

NOTE : Each set contains 30 questions. Time limit is 45 minutes.

  1. The quality, or timbre, of a musical sound is due to...
    [A] its fundamental frequency  [B] its overtone structure
    [C] its amplitude              [D] the presence of beats
  2. If θ is the inclination and μs, the coefficient of static friction, then a cylinder can roll on the inclined plane without slipping for...
    [A] μs ≥ tanθ [B] μs ≥ (tanθ)/3 [C] μs ≥ (1/tanθ) [D] μs ≥ (1/3tanθ)
  3. The moment of inertia of a rigid body is...
    [A] always constant                [B] does not change generally 
    [C] depends on number of particles [D] different for different axes
  4. Ball A is thrown horizontally and ball B is dropped from the same height at the same moment. Then...
    [A] A reaches the ground first 
    [B] B reaches the ground first
    [C] A has greater speed when it reaches the ground
    [D] B has greater speed when it reaches the ground
  5. If for the planets in the solar system, r is the radius of the orbit and T is the periodic time, then the ratio r3/t2 is...
    [A] 1 [B] same for all planets [C] more for farther planets [D] less for farther planets
  6. The adiabatic equation for the ideal gas, PVγ = constant can also be written as...
    [A] PV = γ [B] PTγ = constant [C] Tγ/Pγ - 1 = constant [D] PVγTγ = R
  7. In any process, the maximum amount of mechanical energy that can be converted to heat...
    [A] depends only on the intake temperature [B] depends only on the exhaust temperature
    [C] depends on the compression ratio       [D] is 100%
  8. Electrical energy in the form of electric current is converted into _____ when a storage battery is charged.
    [A] electrical [B] thermal [C] chemical [D] light
  9. The power consumed by a resistance that obeys Ohm's law is given by...
    [A] P = V2/R [B] P = V2R [C] P = IR [D] P = IR2
  10. Faraday's constant is...
    [A] 96487 coulomb/g [B] 96487 coulomb/mole [C] 964870 coulomb/g [D] 964870 coulomb/mole
  11. When the lead storage cell is fully charged, its voltage and specific gravity of electrolyte, respectively are...
    [A] 2.1 V, 1.825 [B] 1.5 V, 1.825 [C] 2.1 V, 1.285 [D] 1.5 V, 1.285
  12. A voltmeter should have a very ____ resistance and should be connected in ____.
    [A] large, parallel [B] large, series [C] small, parallel [D] small, series
  13. I1 and I2 are currents in primary and secondary coils respectively, of a step-up transformer. Then...
    [A] I1 is smaller than I2
    [B] I1 is smaller than or equal to I2
    [C] I1 is greater than I2
    [D] I1 greater than or equal to I2
  14. If A is the area of a coil of N turns rotating with angular speed ω in a uniform magnetic field B, then the instantaneous value of e.m.f. generated in the coil is...
    [A] NABω [B] NABω sint [C] NABω sinωt [D] NABω cost
  15. In an LCR circuit resonance occurs at the frequency for which...
    [A] XL > XC [B] XL < XC[C] XL - XC = 0 [D] XL = 0
  16. λ (wavelength) of visible light is...
    [A] more than λ of ultraviolet light [B] more than λ of infra-red light
    [C] less than λ of X-rays            [D] more than λ of microwaves
  17. The phase difference between two waves superimposing at a point for destructive interference to occur should be...
    [A] nπ [B] 2nπ [C] (2n + 1)π/2 [D] (2n + 1)π
  18. Diffraction in visible light is harder to observe because of...
    [A] low frequencies [B] high velocity [C] visibility [D] short wavelength
  19. The charge to mass ratio (specific charge) for an electron (in coulomb/kg) is approximately equal to...
    [A] 1.76 x 10-11 [B] 1.76 x 1011 [C] 1.76 x 10-8 [D] 1.76 x 108
  20. If Vs is the stopping potential and e is the charge on electron, the energy required by the electron to cross over this potential difference is...
    [A] Vs/e2[B] Vs/e [C] (Vs)2/e [D] Vs . e
  21. The change of energy level is always accompanied by the emission or absorption of radiation depending upon the size of...
    [A] the energy change [B] the atom [C] the nucleus [D] the electron
  22. In the hydrogen spectrum, the series obtained in the ultraviolet region is...
    [A] Balmer series [B] Lyman series [C] Paschen series [D] Pfund series
  23. In an N-type semiconductor...
    [A] free electron density exceeds hole density [B] hole density exceeds free electron density
    [C] free electrons are absent                  [D] holes are absent
  24. A diode allows electric current...
    [A] to increase                   [B] to decrease 
    [C] to flow in one direction only [D] to flow alternately in both directions
  25. Two forces 2i - 3j and _____ have a resultant 5i + 4j.
    [A] 7i + j [B] -3i - 7j [C] 3i + 7j [D] 7i + 7j
  26. If the magnitude of electromagnetic force is 1, the relative strength of strong force is...
    [A] 10-2 [B] 10-1 [C] 10 [D] 102
  27. During an interaction of two particles, the changes produced in velocity are always...
    [A] constant               [B] equal for both particles 
    [C] in opposite directions [D] in direct proportion to their weights
  28. Which of the following is not a unit of power?
    [A] joule.second [B] watt [C] horsepower [D] newton.meter/second
  29. A 1 kg mass has a P.E. of 1 joule relative to the ground when it is at a height of about...
    [A] 0.12 m [B] 1.0 m [C] 9.8 m [D] 32 m
  30. An object in motion need not have...
    [A] velocity [B] momentum [C] K.E. [D] P.E.

Tuesday, April 1, 2014

MCQ : Set #14

NOTE : Each set contains 30 questions. Time limit is 45 minutes.

  1. Intermolecular forces are attractive when the separation of molecules is...
    [A] more than the equilibrium separation [B] less than the equilibrium separation
    [C] equal to the equilibrium separation  [D] zero
  2. The inter atomic potential is dependent on...
    [A] the shape of the atoms only                       [B] the distance between the atoms only 
    [C] both the shape and the distance between the atoms [D] none of above
  3. The shear stress that acts on an object affects its...
    [A] length [B] width [C] volume [D] shape
  4. The only elastic modulus that applies to liquids is...
    [A] Young's modulus [B] Shear modulus [C] modulus of rigidity [D] bulk modulus
  5. In the steady flow, the streamlines...
    [A] do not exist          [B] are fixed in number 
    [C] intersect one another [D] do not intersect one another
  6. If the radius of a pipe is increased by 50%, the fluid velocity v becomes...
    [A] (3/2).v [B] (2/3).v [C] (4/9).v [D] (9/4).v
  7. The average speed of the molecules in a bottle of gas at pressure P and absolute temperature T is doubled. The new pressure and temperature are, respectively...
    [A] 2P, 2T [B] 4P, 4T [C] 4P, 2T [D] 2P, 4T
  8. In the equation, PV = constant, the value of the constant depends on...
    [A] the temperature of the gas              [B] the mass of the gas 
    [C] the temperature and the mass of the gas [D] the temperature and the pressure of the gas
  9. For water, triple point occurs at...
    [A] 76 mmHg, 273.16K [B] 76 mmHg, 273.16°C [C] 4.58 mmHg, 273.16K [D] 4.58 mmHg, 273.16°C
  10. The density of water is maximum at...
    [A] 0°C [B] 4°C [C] 30°C [D] 32°F
  11. Dipole moment is...
    [A] a scalar               [B] a vector from -q to +q 
    [C] a vector from +q to -q [D] a vector perpendicular to the distance vector
  12. If an ebonite rod is rubbed with fur...
    [A] the rod gets electrified                 [B] the fur gets electrified 
    [C] both the fur and the rod get electrified [D] none gets electrified
  13. For a magnet placed in a magnetic field, the maximum torque occurs when the axis of the magnet is...
    [A] perpendicular to the field   [B] parallel to the field
    [C] inclined at 45° to the field [D] inclined at 180° to the field
  14. Optical fibres use the principle of...
    [A] refraction                [B] total internal refraction
    [C] total internal reflection [D] total internal absorption
  15. When light travels in different materials...
    [A] the wavelength remains constant [B] the frequency remains constant
    [C] the velocity remains constant   [D] none of three remains constant
  16. If a star A is two magnitudes brighter than star B, we say that A is _____ times brighter than B.
    [A] 2 [B] 2 x 2.512 [C] 2.512 x 2.512 [D] 100
  17. If λ0 is emitted wavelength, λ is measured wavelength and Z is the displacement of spectral line, then...
    [A] Z = (λ0 - λ)/λ [B] Z = (λ0 - λ)/λ0 [C] λ = λ0 (Z + 1) [D] λ0 = λ(Z + 1)
  18. The magnitude of vector 2i - 3j + √ 3.k is...
    [A] 2 [B] 3 [C] √ 2 [D] 4
  19. The M.I. of a disc about an axis passing through its centre and perpendicular to its plane is 100 gm.cm2. Then, its M.I. about its diameter is...
    [A] 100 gm.cm2 [B] 50 gm.cm2 [C] 200 gm.cm2 [D] 25 gm.cm2
  20. A ring , a disc and a sphere, all of same mass and radius, rotate with the same angular velocity about their diameter. Which has maximum rotational kinetic energy?
    [A] Ring [B] Disc [C] Sphere [D] All have same kinetic energy
  21. If the earth stops rotating, the value of 'g' will...
    [A] increase [B] decrease [C] not change [D] become zero
  22. A parrot resting on a floor of an air-tight box, which is being carried by a girl starts flying. The girl will feel that the box...
    [A] is now lighter [B] is now heavier [C] shows no change in weight [D] is also flying
  23. The thermal resistance of a metal block of length l, area of cross-section A and thermal conductivity k is...
    [A] l/(k.A) [B] l.A/k [C] k.A/l [D] k.l/A
  24. The equivalent thermal conductivity of a slab consisting of two parallel layers of two different materials of thermal conductivity K1 and K2 is...
    [A] K1 + K2 [B] K1.K2 [C] (K1 + K2)/2 [D] (2K1 + K2)/(K1 + K2)
  25. A sphere, a cube and a thin circular plate, all made of same material and of same mass are heated to a temperature of 100°C. Which of these cools faster when left in air at room temperature?
    [A] Sphere [B] Circular plate [C] Cube [D] All of them at the same rate
  26. No energy is transmitted in a...
    [A] longitudinal progressive wave [B] stationary wave 
    [C] transverse progressive wave   [D] electromagnetic wave
  27. The velocity of sound in air is V. At what speed a source must travel towards a listener at rest so that the apparent frequency heard is double the true frequency of the source?
    [A] V/2 [B] V/4 [C] 2V [D] 4V
  28. A spring with force constant k is cut in half. Each of the new springs has a force constant of...
    [A] k/2 [B] k [C] 2k [D] √ 2.k
  29. A harmonic oscillator of mass 40 g has a period of 10 seconds. To reduce the period to 5 seconds, the mass should be changed to...
    [A] 10 g [B] 20 g [C] 80 g [D] 160 g
  30. An example of a purely longitudinal wave is...
    [A] a sound wave [B] an electromagnetic wave 
    [C] a water wave [D] a wave in a stretched string

Saturday, March 29, 2014

MCQ : Set #13

NOTE : Each set contains 30 questions. Time limit is 45 minutes.

  1. Maximum reinforcement of two waves is obtained at points with phase difference of...
    [A] nπ [B] nπ/2 [C] 2nπ [D] (2n + 1)π/2
  2. If 'd' is the width of slit, the diffraction is greater for...
    [A] larger d, larger λ  [B] larger d, smaller λ 
    [C] smaller d, larger λ [D] smaller d, smaller λ
  3. The SI unit of Planck's constant is...
    [A] J [B] J/s [C] J.s [D] J/s.K
  4. The energy of an electron depends on...
    [A] its distance from the nucleus [B] the diameter of the nucleus 
    [C] its diameter                  [D] its charge
  5. Which of the following is not the spectral series obtained in the hydrogen spectrum?
    [A] Balmer series [B] Pascal series [C] Pfund series [D] Paschen series
  6. The conductivity of a semiconductor can be changed by adding impurities and by...
    [A] changing its size [B] changing its shape [C] changing its density [D] irradiation
  7. A body falling from rest covers a distance h/2 in the last second of its fall. Then the height h from which it falls is...
    [A] 9.8 m [B] 58.28 m [C] 100/√ 2 m [D] 50/√ 2 m
  8. The two ends of a train moving with uniform acceleration pass a certain point with velocities v1 and v2. The velocity with which the middle point of the train passes the same point is...
    [A] √(v12 + v22)/2 [B] √(v12 - v22)/2 [C] √(v22 - v12)/2 [D] (v1 + v2)/2
  9. The angle which the vector 3i + 4j makes with X-axis is...
    [A] 30° [B] 45° [C] tan-1 (4/3) [D] tan-1 (3/4)
  10. Two bodies of equal mass are in uniform circular motion with the same period.If r1 and r2 are the radii of their circular paths then the ratio of their centripetal force is...
    [A] r12 / r22 [B] r22 / r12 [C] r1 / r2 [D] r2 / r1
  11. A ball is dropped from a vertical height 'h' on the ground. If 'e' is the coefficient of restitution then the height to which the ball goes up after it rebounds for n-th time is...
    [A] h/(en) [B] h/(e2n) [C] h.(en) [D] h.(e2n)
  12. Water falls on the blades of a turbine at the rate of 10 kg/s from a height of 10 m. The power delivered to the turbine is...(take g = 10 m/s2)
    [A] 1 W [B] 1 kW [C] 100 W [D] 100 kW
  13. An electric fan has a blade of length l. The fan makes n rotations in one minute. The acceleration of a point on the tip of the blade is...
    [A] 4π2.l/n [B] 4π2.l.n2/(60 x 60) [C] 4π2.l.n2/60 [D] 4π2.l/60n
  14. A body of mass m slides down an incline and reaches the bottom with velocity v. If a ring of same mass rolls down the same incline then the velocity of the ring at the bottom is...
    [A] v [B] 2v [C] v/√ 2 [D] (√ 2)v
  15. The gravitational force between two particles of mass 2 kg each separated by a distance 2m is...
    [A] 6.67 x 10-11 N [B] 0 [C] 3.335 x 10-11 N [D] 13.34 x 10-11 N
  16. The period of revolution of a satellite in a circular orbit of radius r is T. The period of the same satellite in another circular orbit of radius 4r is...
    [A] T/4 [B] T/8 [C] 2T [D] 8T
  17. If K is Boltzmann's constant, the average kinetic energy of a molecule of a perfect gas is...
    [A] 2/3 kT [B] 2.5 kT [C] 3.5 kT [D] 1.5 kT
  18. The efficiency of a Carnot engine working between constant high temperature T1 and constant low temperature T2 is maximum when...
    [A] T1 and T2 are high       [B] T1 is high and T2 is low 
    [C] T2 is high and T1 is low [D] T1 and T2 equal
  19. A cooking vessel must have...
    [A] high thermal conductivity and high specific heat 
    [B] low thermal conductivity and low specific heat
    [C] high thermal conductivity and low specific heat
    [D] low thermal conductivity and high specific heat
  20. The total energy of a particle executing SHM is 100 J.Then the maximum value of kinetic energy is...
    [A] 50 J [B] 100 J [C] 25 J [D] 10 J
  21. When a mass m is suspended from a spring its period of oscillation is one second. If the mass is reduced to m/2, the new period will be...
    [A] 1 second [B] 1/2 second [C] √ 2 second [D] 1/(√ 2) second
  22. Which of the following quantities can be considered as the fundamental quantity of a wave?
    [A] Velocity [B] Frequency [C] Wavelength [D] Amplitude
  23. In a stationary wave, strain is...
    [A] maximum at node [B] maximum at antinode 
    [C] minimum at node [D] equal at nodes and antinodes
  24. Dimensions of momentum are...
    [A] M1L1T1 [B] M1L1T-2 [C] M1L-1T-2 [D] M1L-1T-1
  25. When a 1-N force acts on a 1-N object that is able to move freely, the object receives...
    [A] a speed of 1 m/s           [B] an acceleration of 1.02 m/s2 
    [C] an acceleration of 1 m/s2  [D] an acceleration of 9.8 m/s2
  26. The coefficient of static friction for steel on ice is...
    [A] 0.1 [B] 0.1 N [C] 0.1 Nm [D] 0.1
  27. The work done in moving an object from A to B against a non-conservative force
    [A] cannot be recovered by moving it from B to A
    [B] does not depend on the path taken between A and B 
    [C] is always entirely converted in to  heat 
    [D] disappears forever
  28. Car A has mass of 1000 kg and speed of 60 kmph. Car B has mass of 2000 kg and speed of 30 kmph. The kinetic energy of car A is...
    [A] half that of car B  [B] equal to that of car B
    [C] twice that of car B [D] four times that of car B
  29. Brownian motion increases as...
    [A] the particle size increases [B] the viscosity of the medium increases
    [C] the temperature increases   [D] the temperature decreases
  30. The equilibrium separation between the molecules corresponds to...
    [A] maximum potential energy [B] minimum potential energy
    [C] zero potential energy    [D] zero kinetic energy

Saturday, March 15, 2014

MCQ : Set #12

NOTE : Each set contains 30 questions. Time limit is 45 min.

  1. A child pulls a toy car weighing 0.20 kg across a smooth floor by means of a string attached to it. If the string makes an angle of 60° to the floor and the child pulls with a force of 2.0 N, then the amount of work he does in pulling the car a distance of 5.0 m is...

    1. 5.0 J
    2. 10.0 J
    3. 12.7 J
    4. 17.3 j

  2. The note middle C played on a piano always differs from middle C played on a violin because of a difference in...

    1. frequency
    2. wavelength
    3. fundamentals
    4. harmonics

  3. chromatic aberration of a lens is caused by...

    1. diffraction
    2. diffusion
    3. dispersion
    4. interference

  4. The molar gas constant is the same for all gases because, at the same pressure and temperature, equal volumes of gases have the same...

    1. number of molecules
    2. average kinetic energy
    3. density
    4. mass

  5. A Hall probe is used to determine...

    1. the magnetic moment of a coil
    2. the susceptibility of a material
    3. relative permittivity
    4. magnetic flux density

  6. In a nuclear fission reactor, graphite is often used for...

    1. absorbing neutrons and controlling the reaction
    2. slowing down neutrons
    3. preventing the radiation from escaping into atmosphere
    4. all the above

  7. In a Newton's rings experiment, the thickness of the air space between the lens and the glass plate is 1.8 x 10-6 m for the sixth dark ring. The wavelength of the light used is...

    1. 1.7 x 10-8 m
    2. 3.0 x 10-7 m
    3. 6.0 x 10-7 m
    4. 6.0 x 10-5 m

  8. If α denotes the current gain of a transistor in the common-base mode of operation and β denotes the current gain in the common-emitter mode, then α and β are related by...

    1. α = β/(1 + β)
    2. α = (1 + β)/β
    3. α = (1 - β)/β
    4. β = (1 + α)/α

  9. A certain metal has a work function of 2 eV. Taking Planck's constant h = 6.6 x 1024 J.s, charge on electron e = 1.6 x 10-19 C and velocity of light C = 3 x 108 m/s, what is its approximate threshold frequency?

    1. 5 x 1013 Hz
    2. 5 x 1014 Hz
    3. 5 x 1015 Hz
    4. 2 x 1015 Hz

  10. A monoatomic gas is allowed to expand adiabatically until its volume is eight times greater. Compared to the original pressure, the new pressure must be smaller by a factor of...

    1. 4
    2. 8
    3. 16
    4. 32

  11. During a negative β-decay...

    1. an atomic electron is ejected
    2. an electron which is already present within the nucleus is ejected
    3. a neutron in the nucleus decays emitting an electron
    4. a part of the binding energy of the nucleus is converted into an electron

  12. A parallel plate capacitor is charged and the charging battery is then disconnected. If the plates of the capacitor are moved farther apart by means of insulating handles...

    1. the charge on the capacitor increases
    2. the voltage across the plates increases
    3. the capacitance increases
    4. the electrostatic energy stored in the capacitor increases

  13. Two bodies M and N of equal masses are suspended from two separate massless springs of spring constants K1 and K2, respectively. If the two bodies oscillate vertically such that their maximum velocities are equal, then the ratio of the amplitude of vibration of M to that of N is...

    1. K1/K2
    2. √(K1/K2)
    3. K2/K1
    4. √(K2/K1)

  14. Two coherent monochromatic light beams of intensities I and 4I are superimposed. The maximum and minimum intensities in the resulting beam are...

    1. 5I, I
    2. 5I, 3I
    3. 9I, I
    4. 9I, 3I

  15. A vessel contains oil (density = 0.8 g/cm3) over mercury (density = 13.6 g/cm3). A homogeneous sphere floats with half its volume immersed in mercury and other half in oil.The density of the material of the sphere in g/cm3 is...

    1. 3.3
    2. 6.4
    3. 7.2
    4. 12.8

  16. An organ pipe P1 closed at one end vibrating in its first harmonic and another pipe P2 open at both ends vibrating in its third harmonic are in resonance with a given tuning fork. The ratio of the length of P1 to that of P2 is...

    1. 8 : 3
    2. 3 : 8
    3. 1 : 2
    4. 1 : 3

  17. Two particles x and y have equal charges, after being accelerated through the same potential difference, enter a region of uniform magnetic field and describe circular paths of radii R1 and R2, respectively. The ratio of the mass of x to that of y is...

    1. (R1/R2)1/2
    2. R2/R1
    3. (R1/R2)2
    4. R1/R2

  18. A feably prepared radioactive source of half life 2 h emits radiation of intensity which is 64 times the permissible safe level. The minimum time after which it would be possible to work safely with this source is...

    1. 6 h
    2. 12 h
    3. 24 h
    4. 128 h

  19. A nuclear bomb explodes 200 km above the surface of moon. The sound of explosion on the moon will...

    1. be heard before the flash of explosion is seen
    2. be heard at the same time explosion occurs
    3. be heard after the explosion
    4. not be heard at all

  20. A blue colour star is...

    1. hotter than white star
    2. cooler than white star
    3. at the same temperature as white star
    4. at 0 K temperature

  21. The position of a particle at time t is √ x = 10 + t, then...

    1. velocity is constant
    2. velocity α t
    3. acceleration α t
    4. acceleration is zero

  22. The maximum height and range of a projectile are equal when the angle of projection is...

    1. 45
    2. 60
    3. tan-1 (1/4)
    4. tan-1 4

  23. A force of 140 N acts on a body of mass 100 kg. If the frictional force is 40 N, then the acceleration of the body is ______ m/s2

    1. 1
    2. 180
    3. 18
    4. 1.8

  24. The work done by centripetal force(F) on a particle of mass m moving round a circle of radius r with a uniform sped of v is

    1. F x r
    2. F x 2πr
    3. zero
    4. F x v

  25. When a sphere rolls without slipping the ratio of translational kinetic energy to total kinetic energy is...

    1. 3 : 7
    2. 1 : 1
    3. 7 : 5
    4. 5 : 7

  26. When a satellite revolves round the earth in an orbit very close to earth its orbital velocity is...

    1. 11.2 m/s
    2. 11.2 km/s
    3. 8 m/s
    4. 8 km/s

  27. The diameter of a water molecule is _____ A°.

    1. 1.5
    2. 2
    3. 1
    4. 3

  28. To produce longitudinal extension we should exert force in...

    1. one direction only
    2. two directions
    3. perpendicular to the body in all directions
    4. parallel to the body

  29. A metal sphere has a spherical cavity in it. When the ball is heated the volume of cavity will...

    1. increase
    2. decrease
    3. not change
    4. depend on mass of sphere

  30. A weightless spring of force constant 5 N/m is cut into two equal halves and the two are connected in parallel. The equivalent force constant of the system in N/m is...

    1. 5
    2. 10
    3. 15
    4. 20

MCQ : set #11

NOTE : Each set contains 30 questions. Time limit is 45 min.

  1. For an object performing SHM the magnitude of maximum velocity is given by...

    1. ω √(A2 - y2)
    2. ω √(y2 - A2)
    3. ωA
    4. ω2A

  2. The reciprocal of wavelength is called...

    1. frequency
    2. wave velocity
    3. amplitude
    4. wave number

  3. ______ is for rotational motion as mass is for linear motion.

    1. mass
    2. torque
    3. moment of inertia
    4. inertia

  4. If m is the mass of a planet, r is radius of its orbit, ω is the angular velocity and v is its linear velocity, then the force acting on planet is...

    1. mrv2
    2. mr2V2
    3. mrω2
    4. mr2ω2

  5. In a fuel cell the conversion of chemical energy into electrical energy takes place...

    1. at both electrodes
    2. at the anode only
    3. at the cathode only
    4. in the electrolyte

  6. Which of the following is not the unit of magnetic flux?

    1. weber
    2. tesla-m2
    3. m2kgs-1
    4. henry

  7. Impulse is equal to...

    1. momentum
    2. change in momentum
    3. change in momentum per unit time
    4. change in momentum per unit mass

  8. 1 kWh is equal to...

    1. 746 W
    2. 3.6 x 106 J
    3. 3.6 hp
    4. 746 kW

  9. The atomic mass of copper is 64 and its density is 9.0 g/cm3. The volume of one mole of atoms of copper is _____ g/cm3.

    1. 6.023 x 1023
    2. (6.023 x 9 x 1023)/64
    3. (6.023 x 64 x 1023)/9
    4. 64/9

  10. Young's modulus for aluminium is 7 x 1010 Pa. The force needed to stretch, an aluminium wire with 2 mm diameter and 800 mm length, by 1 mm is...

    1. 2.75 N
    2. 275 N
    3. 1.10 N
    4. 275 kN

  11. The MKS unit of coefficient of viscosity is...

    1. poise
    2. centipoise
    3. Pa second-1
    4. Pa second

  12. Electric charge is quantized. This means that the electric charge...

    1. is not continuous
    2. is continuous
    3. is constant
    4. has mass

  13. A 2 kg ball moves with a speed of 8 m/s and collides with a 4 kg ball moving in the same direction with a speed of 2 m/s. After the collision, the heavier ball has a speed of 5 m/s. The collision results in a decrease in the total kinetic energy of translation of two balls of...

    1. 0 J
    2. 6 J
    3. 12 J
    4. 18 j

  14. The result of combining two mutually perpendicular vibrations was first extensively studied by...

    1. Huygens
    2. Lissajon
    3. Sabine
    4. Newton

  15. On a sunny day you may see very bright lines formed on the bottom of a swimming pool. The prime cause of these is...

    1. absorption
    2. diffraction
    3. interference
    4. refraction

  16. A piece of glass which has been heated to a high temperature is left to cool. If the glass cracks, it will most likely be because of...

    1. low thermal conductivity of glass
    2. high thermal conductivity of glass
    3. low specific heat capacity of glass
    4. high specific heat capacity of glass

  17. The charge to mass ratio of an electron is about 1.8 x 1011 C kg-1. In a certain television tube, where the accelerating voltage is 1600V, the electrons have a speed just before striking the screen of approximately...

    1. 16000 kms-1
    2. 20000 kms-1
    3. 24000 kms-1
    4. 28000 kms-1

  18. A mass spectrometer may be used to distinguish between...

    1. different elements
    2. different isotopes
    3. identical isotopes bearing different charge
    4. all of the above

  19. If a train is to move with velocity of light, its length would be

    1. infinite
    2. unchanged
    3. zero
    4. half the original

  20. A radio-station broadcasts at 30 m band. The frequency of electromagnetic waves transmitted from this station could be...

    1. 10 MHz
    2. 10 kHz
    3. 3 x 1010 Hz
    4. 11 x 1011 Hz

  21. The energy generation in stars is due to...

    1. fusion of heavy nuclei
    2. fusion of light nuclei
    3. chemical reaction
    4. fission of heavy nuclei

  22. Two resistances are joined in parallel whose resultant is 6/5 ohm. One of the resistance wires is broken and the effective resistance becomes 2 ohm. The resistance in ohm of the wire that got broken is...

    1. 2
    2. 3
    3. 3/5
    4. 6/5

  23. When the distance between a source and a cliff is 'd', the time taken to hear the first echo of sound with velocity 'V' is...

    1. V.d
    2. 2V/d
    3. 2d/V
    4. d/V

  24. Which of the following pairs of physical quantities have the same unit?

    1. Force and power
    2. Stress and strain
    3. Young's modulus and pressure
    4. Coefficient of viscosity and surface tension

  25. The area enclosed by the displacement-time graph of a body thrown in air gives...

    1. average speed
    2. average velocity
    3. acceleration
    4. no significant physical quantity

  26. A particle is moving eastwards with a velocity of 5 m/s. In 10 seconds the velocity changes to 5 m/s northwards. The average acceleration in this time is...

    1. zero
    2. (1/√ 2) m/s2 towards northwest
    3. (1/√ 2) m/s2 towards northeast
    4. (1/2) m/s2 towards northwest

  27. Swimming becomes possible because of _____ law of motion.

    1. First
    2. Second
    3. Third
    4. none of the three

  28. A thin film of liquid is enclosed between two glass plates. It is difficult to separate the plates on account of...

    1. Viscosity
    2. Surface tension
    3. Friction
    4. Atmospheric pressure

  29. The highest temperature that can be recorded by a mercury thermometer is...

    1. 100°C
    2. 157°C
    3. 257°C
    4. 357°C

  30. A tuning fork originally in unison with another fork of frequency 260 Hz, produces 4 beats per second, when a little wax is attached to it. What is the frequency now?

    1. 260 Hz
    2. 264 Hz
    3. 256 Hz
    4. 262 Hz

MCQ : Set #10

NOTE : Each set contains 30 questions. Time limit is 45 min.

  1. A toy for firing a ball vertically consists of a spring which is compressed 0.10 m by an average force of 5.0 N. If a ball of mass 0.05 kg is placed on the spring and the spring released, the ball will reach a height of ...

    1. 1.0 m
    2. 1.2 m
    3. 1.4 m
    4. 1.6 m

  2. A horizontal rope is fixed at one end. The other end is held in the hand and a wave motion is generated by moving the hand up and down repeatedly. A stationary wave is formed and it is observed that a small piece of ribbon tied to the rope is about half way between a node and an adjacent antinode. The movement of the ribbon is...

    1. up and down
    2. back and forth
    3. a combination of A & B
    4. impossible to determine

  3. In an astronomical telescope, the objective lens forms an image that is...

    1. real and erect
    2. real and inverted
    3. virtual and erect
    4. virtual and inverted

  4. The specific latent heat of vaporisation of water is 2.3 x 106 J/kg. The percentage of this energy that is necessary to overcome atmospheric pressure is...

    1. 0
    2. between 0 and 50%
    3. 50%
    4. between 50 and 100%

  5. The electron-volt is a measure of...

    1. charge
    2. current
    3. potential
    4. energy

  6. In which of the following units could Planck's constant be expressed?

    1. joule
    2. joule-hertz
    3. joule-second
    4. newton-second

  7. The capacitance of a parallel plate capacitor would be decreased by...

    1. increasing the separation of the plates
    2. increasing the area of overlap of the plates
    3. replacing the air between the plates by paper
    4. replacing the air between the plates by mica

  8. Two light sources have exactly the same frequency and are always exactly out of step with each other. This is an example of...

    1. phase reversal
    2. Huygen's principle
    3. coherence
    4. destructive interference

  9. Two bodies of mass m1 and m2 are moving with equal kinetic energy.The ratio of their linear momentum P1 : P2 is...

    1. m1 : m2
    2. m2 : m1
    3. m12 : m22
    4. √m1 : √m2

  10. The force required to make the length of a wire three times its original length is ____ when the area of cross-section is unity and Y is the Young's modulus.

    1. 2Y
    2. 3Y
    3. Y
    4. Y/2

  11. The first law of thermodynamics is a special case of...

    1. law of conservation of momentum
    2. law of conservation of energy
    3. Boyle's law
    4. Charles' law

  12. If the velocity of sound in air at 0°C is 300 m/s, at what temperature will the velocity be 400 m/s?

    1. 330°C
    2. 485°C
    3. 674°C
    4. 1000°C

  13. A ray of light incident on a 60° angled prism of refractive index √ 2, suffers minimum deviation. The angle of incidence is...

    1. 75°
    2. 45°
    3. 60°

  14. Two equal negative charges(-q) are fixed at two points (0,a) and (0,-a) on the Y-axis. A positive charge q is released from rest at the point (2a,0) on the X-axis. The charge q will...

    1. execute SHM about the origin
    2. move to the origin and remain at rest
    3. move to infinity
    4. execute oscillatory motion but not SHM.

  15. Ball-point pen functions on the principle of

    1. viscosity
    2. Boyle's law
    3. gravitational force
    4. surface tension

  16. A soap bubble has a radius of 3 cm. The surface tension of soap solution is 1.5 x 10-2 N/m. The excess of pressure (in N/m2) is equal to...

    1. 1
    2. 2
    3. 0.5 x 10-2
    4. 1.0 x 10-2

  17. In case of a prism, the angle of deviation is greater for...

    1. violet
    2. red
    3. blue
    4. green

  18. A piece of copper and another of germanium are cooled from room temperature to 80K. The resistance of...

    1. each of them increases
    2. each of them decreases
    3. copper increases and germanium decreases
    4. copper decreases and germanium increases

  19. Which of the following is always attractive?

    1. Strong force
    2. Electrostatic force
    3. Magnetic force
    4. None of the three

  20. A non-conservative force does not give rise to...

    1. thermal energy
    2. kinetic energy
    3. light energy
    4. potential energy

  21. If EA is the energy required for the equilibrium separation of two hydrogen atoms in a molecule of hydrogen and EM is the energy required for the equilibrium separation of two molecules of hydrogen, then...

    1. EA = EM
    2. EA = EM/(√ 2)
    3. EA > EM
    4. EA < EM

  22. When pressure of 2.0 MPa is applied to a sample of kerosene, it contracts by 15%. The bulk modulus of kerosene is...

    1. 1.7 MPa
    2. 1.997 MPa
    3. 2.003 MPa
    4. 1.3 GPa

  23. A wetting agent...

    1. reduces angle of contact
    2. increases angle of contact
    3. increases surface tension
    4. increases surface area

  24. When a slab of insulating material is introduced in a capacitor, its capacitance

    1. becomes zero
    2. decreases considerably
    3. increases considerably
    4. does not change

  25. For a constant-length pendulum, the periodic time depends on

    1. amplitude
    2. length
    3. mass of pendulum
    4. 'g'

  26. The amplitude of a sound wave determines its...

    1. pitch
    2. loudness
    3. overtones
    4. resonance

  27. The value of 'g' at pole is...

    1. greater than that at the equator
    2. smaller than that at the equator
    3. equal to that at the equator
    4. zero

  28. Which of the following engines is the most efficient?

    1. gasoline
    2. diesel
    3. gas turbine
    4. Carnot

  29. A 50-V battery is connected across a 10-ohm resistor and a current of 4.5 A flows. The internal resistance of the battery is...

    1. 0
    2. 0.5 ohm
    3. 1.1 ohm
    4. 5 ohm

  30. In an LCR series circuit Q-factor is given by...

    1. 1/√LC
    2. √(L/C)
    3. (1/R).√(L/C)
    4. R/(√LC)

MCQ : Set #9

NOTE : Each set contains 30 questions. Time limit is 45 min.

  1. The error in measuring the radius of a sphere is 2%. Then the error in the measurement of its volume is...

    1. 8%
    2. 6%
    3. 2%
    4. 9%

  2. A magician is throwing rings into air in such a way that when a ring is at its maximum height he throws another ring. If the time difference between each throw is 1 sec then the height attained by the ring is...

    1. 49 m
    2. 49 cm
    3. 9.8 m
    4. 4.9 m

  3. If the mass and force are doubled then the acceleration will...

    1. double
    2. become thrice
    3. become four times
    4. remain same as before

  4. A string is tied to the neck of a bottle containing soda water and then whirled in a vertical circle. The bubbles will be found...

    1. near the neck
    2. at the bottom
    3. at the centre
    4. everywhere in the bottle

  5. If the absolute temperature of a gas is doubled, then Vrms will become

    1. 2 times
    2. √ 2 times
    3. 1/2 times
    4. 4 times

  6. When the temperature of a black body is lowered to half its original value then the amount of heat radiated will be reduced to...

    1. 1/2
    2. 1/4
    3. 1/8
    4. 1/16

  7. A shell is fired from a cannon with a velocity V at an angle θ with the horizontal direction. At the highest point in its path it explodes into two pieces of equal mass. One of the pieces retraces its path to the cannon then the speed of the other immediately after the explosion is...

    1. 3Vcosθ
    2. 2Vcosθ
    3. 3/2
    4. (√ 3)Vcosθ/2

  8. X-rays have energy of the order of...

    1. 10 eV
    2. 106 eV
    3. infinity
    4. zero

  9. In Rutherford model of the atom, the path of an electron will be...

    1. a straight line
    2. parabolic
    3. circular
    4. spiral

  10. A double concave lens of glass, placed in a liquid of refractive index 2, will behave as...

    1. diverging lens
    2. concave mirror
    3. converging lens
    4. none of the above

  11. Megawattday is the unit of...

    1. power
    2. force
    3. energy
    4. density

  12. A particle executes SHM with its frequency f. The frequency with which its kinetic energy oscillates is...

    1. f/2
    2. f
    3. 2f
    4. 4f

  13. If the acceleration due to gravity,g, is about 10 m/s2 near the surface of the earth, then at the centre of the earth g would have an approximate value of...

    1. zero
    2. 5 m/s2
    3. 10 m/s2
    4. 20 m/s2

  14. A tuning fork vibrates at a frequency of f Hz. It is viewed through a stroboscopic disc having four equally spaced slots in it. In order for the vibrating tuning fork to appear stationary, the minimum number of revolutions per second at which the disc should be rotated is...

    1. f/8
    2. f/4
    3. f/2
    4. f

  15. Which of the following materials has the greatest relative permittivity?

    1. Air
    2. Glass
    3. Mica
    4. Water

  16. The distance between two consecutive antinodes is...

    1. λ
    2. λ/2
    3. λ/3
    4. λ/4

  17. For an object below the earth's surface, if the distance of the object from earth's centre is 'd', then the acceleration due to gravity is proportional to...

    1. d
    2. d2
    3. 1/d
    4. 1/d2

  18. A type of process that does not need outside energy to reverse is one that occurs at constant...

    1. temperature
    2. pressure
    3. volume
    4. speed

  19. Which of the following combinations of length(l) and cross-sectional area(A) will give a certain volume of copper the least resistance?

    1. l and A
    2. 2l and A/2
    3. l/2 and 2A
    4. none

  20. Inside a solenoid, the magnetic field...

    1. is zero
    2. is uniform
    3. increases with distance from the axis
    4. decreases with distance from the axis

  21. When the voltage are in phase in an a.c. circuit...

    1. impedance is zero
    2. reactance is zero
    3. resistance is zero
    4. phase angle is 90°

  22. The distance between two consecutive bright fringes increases as...

    1. the wavelength increases
    2. the frequency increases
    3. the wavelength decreases
    4. the separation of two sources increases

  23. Photoelectric effect can be explained on the basis of...

    1. the wave theory of light
    2. the theory of relativity
    3. the theory of black-body radiation
    4. none of the above

  24. Acoustics is the branch of physics studying...

    1. light
    2. heat
    3. sound
    4. motion of planets

  25. The prefix 'pico' represents...

    1. 10-9
    2. 10-12
    3. 109
    4. 1012

  26. The unit vector in the same direction as(-3i + 4j) is...

    1. (-3/5)i + (4/5)j
    2. -i + j
    3. 3i - 4j
    4. (-1/3)i + (1/4)j

  27. An 800-kg car moving at 80 kmph overtakes a 1200-kg car moving at 40 kmph in the same direction. If the two cars stick together,the wreckage has an initial speed of...

    1. 8 kmph
    2. 40 kmph
    3. 56 kmph
    4. 60 kmph

  28. For a fixed mass of gas in an isothermal process, the plot of V→(1/p) is...

    1. a straight line
    2. a parabola
    3. a nonparabolic curve
    4. a hyperbolic curve

  29. When a vapour condenses into liquid...

    1. it absorbs heat
    2. it volves heat
    3. its temperature rises
    4. its temperature falls

  30. For a rectangular glass slab, the entering ray and the emerging ray...

    1. are parallel
    2. form a right angle
    3. form an acute angle
    4. form an obtuse angle