Question # 1

Two bodies of masses m₁ and m₂ have equal momentum their kinetic energies E₁ and E₂ are in the ratio

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√m₁ : √m₂

m₁: m₂

m₂: m₁

m₁² : m₂²

If the dot product of two non-zero vectors vanishes the vectors will be

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In the same direction

Opposite to each other

Perpendicular to each other

Zero

Energy is stored in the choke coil in the form of

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Heat

Magnetic energy

Electric energy

Electro -magnetic energy

The nucleus 6C12 absorbs an energetic neutron and emits a beta particle (β) The resulting nucleus is

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₇N¹⁴

₅B¹³

₇N¹³

₆N¹³

A particle moves along a circular path under the action of a force. The work done by the force is

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Zero

Positive and non-zero

Negative and non zero

None of above

With the increase of temperature viscosity

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Increase

Decrease

Remains same

Doubles

As the electron in Bohr orbit of hydrogen atom passes from stat n = 2 to n = 1 the kinetic energy K and potential energy U change as

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K two-fold,U also two-fold

K four-fold,U also four-fold

K four-fold,U two-fold

The sum of the magnitude of two forces acting at a point is 18 and the magnitude of their resultant is 12. If the resultant is at 90° with the force of the smaller magnitude then their magnitude are:

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3, 15

4, 14

5, 13

6, 12

Velocity of sound in a diatomic as is 300 m/sec what is its rms velocity

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400 m/sec

40 m/sec

430 m/sec

300 m/sec

The product of the pressure and volume of an ideal gas is

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A constant

Approximately equal to the universal gas constant

Directly Proportional to its temperature

Inversely proportional to its temperature

If the amplitude of sound is doubled and the frequency reduced to one-fourth the intensity of sound at the same point will be

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Increasing by a factor of 2

Decreasing by a factor of 2

Decreasing by a factor of 4

Unchanged

Which of the following is the only vector quantity?

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Temperature

Energy

Power

Momentum

The unit of inductance is equivalent to

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V x s/A

V x A/s

A x s/v

V/A x s

A (100 W, 200 V) bulb is connected to a 160 V power supply. The power consumption would be

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64 W

80 W

100 W

125 W

The velocity of falling raindrops attains limited value because of

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Up thrust of air

Viscous force exerted by air

Surface tension effect

Air currents atmosphere

In a simple harmonic motion the kinetic energy (KE) and the potential energy (PE), are such that throughout the motion

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KE remains constant

PE remains constant

KE/PE is constant

KE+PE remains constant

A 50-volt battery is connected across 10-ohm resistor. The current is 4.5 A. The internal resistance of the battery is

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Zero

0.5 ohm

1.1 ohm

5.0 ohm

The velocity of a particle at an instant is 10 m/s and after 5s the velocity of the particle is 20 m/s. The velocity 3s before in m/s is:

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8

4

6

7

A sun rise or sun set, the sun looks reddish because:

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The sun is coldest at these times

Of the effects of reflection and refraction

The sun is hottest at these times

Of the scattering of light

The percentage errors in the measurements of mass and speed are 2% and 3% respectively. How much will be the maximum error in the estimate of the kinetic energy obtained by measuring mass and speed

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11%

8%

5%

1%

Which of the following is a scalar quantity?

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Density

Displacement

Torque

Weight

Two point charges A and B separated by a distance R attract each other with a force of 12 x 10^-3N. The force between A and B when the charges on them are doubled and distance is halved

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1.92 N

19.2 N

12 N

0.192 N

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