MCQs In Higher Secondary Physics: April 2014

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

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

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

The shear stress that acts on an object affects its...
```
[A] length [B] width [C] volume [D] shape
```

The only elastic modulus that applies to liquids is...

[A] Young's modulus [B] Shear modulus [C] modulus of rigidity [D] bulk modulus

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

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
```
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
```

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

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

The density of water is maximum at...
```
[A] 0°C [B] 4°C [C] 30°C [D] 32°F
```

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

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

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

Optical fibres use the principle of...

[A] refraction                [B] total internal refraction
[C] total internal reflection [D] total internal absorption

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

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
```
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)
```
The magnitude of vector 2i - 3j + √ 3.k is...
```
[A] 2 [B] 3 [C] √ 2 [D] 4
```
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
```
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
```

If the earth stops rotating, the value of 'g' will...

[A] increase [B] decrease [C] not change [D] become zero

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
```
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
```
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)
```
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
```

No energy is transmitted in a...

[A] longitudinal progressive wave [B] stationary wave 
[C] transverse progressive wave   [D] electromagnetic wave

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
```
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
```
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
```

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

MCQs In Higher Secondary Physics

Tuesday, April 1, 2014

MCQ : Set #14

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