A ball is released from certain height which losses 50% of its kinetic energy on striking the ground, it will attain a height again

1. 14th of initial height

2. 12th of initial height

3. 34th of initial height

4. None of the above

Subtopic:  Gravitational Potential Energy |
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If applied torque on a system is zero, i.e., = 0, then for that system

1. ω=0

2. =0

3. J=0

4. F=0

Subtopic:  Angular Momentum |
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A steel wire of 1 m long and 1mm2 cross section area is hanged from rigid end when weight of 1 kg is hang from it, then change in length will be 
(Young’s coefficient for wire Y = 2 x 1011 N/m2)

1. 0.5 mm

2. 0.25 mm

3. 0.05 mm

4. 5 mm

Subtopic:  Stress - Strain |
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When plate voltage in diode valve is increased from 100V to 150V. Then, plate increases from 7.5 mA to 12 mA, then dynamic plate resistance will be

1. 10kΩ

2. 11kΩ

3. 15kΩ

4. 11.1kΩ

Subtopic:  PN junction |
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If the sun rays are indenting at 60 ° angle and intensity is I. If the sun rays are made incident at 30 ° angle, then what will be the intensity?

1. I3

2. 3 I

3. 3I

4. I3

Subtopic:  Superposition Principle |
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The reason of current flow in p-n junction in forward bias is

1. Drifting of charge carriers

2. Drifting of minority charge carriers

3. Diffusion of charge carreirs

4. All of the above

Subtopic:  PN junction |
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A charged particle is accelerated by a potential of 200V. If its velocity is 8.4 x 108 m/s, then value of e/m for that particle is

1. 17.6×1016

2. 14.5×1012

3. 1.76×1015

4. 1.45×1015

Subtopic:  Electric Field |
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When an open organ is dipped in water up to half of its height, then its frequency will become

1. Half

2. Double

3. Remain same

4. Four time

Subtopic:  Standing Waves |
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A sound source producing waves of frequency 300 Hz and wavelength 1m observer is stationary, while source is going away with the velocity 30 m/s, then apparent frequency heard by the observer is

1. 270Hz

2. 273Hz

3. 383Hz

4. 300Hz

Subtopic:  Doppler's Effect |
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A particle moves towards east for 2 s with velocity 15 m/s and move towards north for 8 s with velocity 5 m/s. Then, average velocity of the particle is

1. 2 m/s

2. 5 m/s

3. 7 m/s

4. 10 m/s

Subtopic:  Average Speed & Average Velocity |
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