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

A p-n junction has a thickness of the order of:

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1 cm

1 mm

10^-6cm

10^-12cm

A man pushes a wall but fails to displace it. He does:

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Negative work

Maximum positive work

Positive work but not maximum

No work

Two forces are acting together on an object. The magnitude of their resultant is minimum when the angle between the force is

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0°

60°

120°

180°

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

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

Which of the following particles would experience the largest magnetic force when projected with the same velocity perpendicular to a magnetic field?

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Proton

Electron

He⁺

Li⁺

Which one of the following is a simple harmonic motion?

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Wave moving through a string fixed at both ends

Earth spinning about its own axis

Ball bouncing between two rigid vertical walls

Particle moving in a circle with uniform speed

The time period of a simple pendulum is 2 seconds. If its length is increased by 4 times, then its period becomes

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16 s

12 s

8 s

4 s

The force between two charges 0.06 m apart is 5 N. If each charge is moved towards the other by 0.01 m, then the force between them will become

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7.20 N

11.25 N

22.50 N

45.00

A photoelectric cell coverts

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Electrical energy to light energy

Light energy to light energy

Light energy to electrical energy

Light energy to elastic energy

The direction of induced current is such that it opposes the very cause that has produced it. This is the law of

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Lenz

Faraday

Kirchoff

Fleming

Two sources of sound are said to be coherent if

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They produce sounds of equal intensity

They produce sounds of equal frequency

They produce sound waves vibrating with the same phase

They produce sound waves with zero or constant phase different all instant of time

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

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

When we apply reverse bias to a junction diode, it

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Lowers the potential barrier

Raise the potential barrier

Increase the majority carrier current

Increase the minority carrier current

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