Question # 1

In a simple harmonic motion (SHM), which of the following does not hold?

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To force on the particle is maximum at the ends

The acceleration in minimum at the mean position

The potential energy is maximum at the mean position

The kinetic energy is maximum at the mean position

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

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₇N¹⁴

₅B¹³

₇N¹³

₆C¹³

The mass of a proton is 1847 times that of an electron. An electron and a proton are projected into a uniform electric field in a direction at right angles to the direction of the field with the same initial kinetic energy.The

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Both the trajectories will be equally curved

The proton trajectory will be less curved than the electron trajectory

The electron trajectory will be less curved than the proton trajectory

The relative curving of the trajectories will be dependent on the value of the initial kinetic energy

A particle is moving in a uniform magnetic filed, then

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its momentum changes but total energy remains the same

Both momentum and total energy remains the same

Both changes

Total energy change but momentum remains

A particle moving in a magnetic field has increase in its velocity, then its radius of the circle

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Decreases

Increases

Remains the same

Becomes half

Which of the following is the only vector quantity?

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Temperature

Energy

Power

Momentum

Which of the following sources give discrete emission spectrum?

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Incandescent electric bulb

Sun

Mercury vapour lamp

Candle

When a hydrogen atom is bombarded, the atom is excited to the n = 4 state of hydrogen atom. The energy released when the atom falls from n = 4 state to the ground state is

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1.275 eV

12.75 eV

5 eV

8 eV

What remains constant in the field of central force?

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Potential energy

Kinetic energy

Angular momentum

Linear momentum

In an L-R circuit, time constant is that time in which current grows from zero to the value

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0.63 I_o

0.50 I_o

0.37 I_o

I_o

What will be the ratio of the distance moved by a freely falling body from rest in 4th and 5th seconds of journey?

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4 : 5

7 : 9

16 : 25

1 : 1

A 220 V, 50 Hz. A.C. source is connected to an inductance of 0.2 H and a resistance of 20 ohm in series. What is the current in the circuit?

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10 A

5 A

33.3 A

3.33 A

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 magnitudes are:

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3, 15

4, 14

5, 13

6, 12

If tube length of astronomical telescope is 105 cm and magnifying power is 20 for normal setting. Calculate the focal length of objective

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100 cm

10 cm

20 cm

25 cm

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

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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