Question # 1

Radio waves of constant amplitude can be generated with

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Rectifier

Filter

FET

Oscillator

In an ac circuit with voltage V and current 1 the power dissipated is

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VI

1/2 VI

1/√2 VI

Depends on the phase between V and 1

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

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11%

8%

5%

1%

A ten-ohm electric heater operates on a 110 V line Calculate the rate at which it develops heat in watts:

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1310 W

670 W

810 W

1210 W

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 Ω

1.1 Ω

5.0 Ω

Which quantity is increased in step-down transformer?

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Current

Voltage

Power

Frequency

Steel is preferred for making springs over copper.Whey?

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Steel is cheaper

Young's modulus of steel is more than that of copper

Young's modulus of copper is more than that of steel

Steel is less likely to be oxidized

The conductivity of a superconductor is

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Infinite

Very large

Very small

Zero

A prism splits a beam of white light into its seven constituent colors this is so because

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Phase of different colors is different

Amplitude of different colors is different

Energy of different colors is different

Velocity of different colors is different

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

Which of the following is a scalar quantity

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Density

Displacement

Torque

Weight

The sieman is the SI unit of

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Resistance

Specific Resistance

Conductance

Inductance

A photocell with a constant p.d. of V volt across it illuminated by a point source from a distance of 25 cm. When the source is moved to a distance of 1m, the electrons emitted by the photocell

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Carry 1/4th their previous energy

Are 1/16th as numerous as before

Are 1/4th as numerous as before

Carry 1/4th their previous momentum

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 conductivity of a superconductor is

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Infinite

Very large

Very small

Zero

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

Mechanical waves on the surfaces of a liquid are

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Transverse

Longitudinal

Torsional

both transverse and longitudinal

In a voltmeter the conduction takes place due to

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Electrons only

Holes only

Electrons and holes

Electrons and ions

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⁺

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

In a common base transistor circuit, the current gain is 0.98. On changing the emitter current by 5.00 mA, the change in collector current is

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0.916 mA

2.45 mA

4.9 mA

5.1 mA

To get a resultant displacement of 10 m, two displacement vectors of magnitude 6 m and 8 m should be combined

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Parallel

Antiparallel

At angle 60°

Perpendicular to each other

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