- 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
- 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)
- 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
- 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
- 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
- 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
- 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%
- 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
- 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
- Faraday's constant is...
[A] 96487 coulomb/g [B] 96487 coulomb/mole [C] 964870 coulomb/g [D] 964870 coulomb/mole
- 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
- A voltmeter should have a very ____ resistance and should be connected in ____.
[A] large, parallel [B] large, series [C] small, parallel [D] small, series
- 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
- 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
- In an LCR circuit resonance occurs at the frequency for which...
[A] XL > XC [B] XL < XC[C] XL - XC = 0 [D] XL = 0
- 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
- 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
- Diffraction in visible light is harder to observe because of...
[A] low frequencies [B] high velocity [C] visibility [D] short wavelength
- 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
- 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
- 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
- In the hydrogen spectrum, the series obtained in the ultraviolet region is...
[A] Balmer series [B] Lyman series [C] Paschen series [D] Pfund series
- 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
- 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
- Two forces 2i - 3j and _____ have a resultant 5i + 4j.
[A] 7i + j [B] -3i - 7j [C] 3i + 7j [D] 7i + 7j
- 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
- 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
- Which of the following is not a unit of power?
[A] joule.second [B] watt [C] horsepower [D] newton.meter/second
- 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
- An object in motion need not have...
[A] velocity [B] momentum [C] K.E. [D] P.E.
