Question # 1

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 henry is the unit for

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Resistance

Magnetic flux

Magnetic field

Inductance

What remains constant when the earth revolves around the sun?

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Angular momentum

Linear momentum

Angular kinetic energy

Linear kinetic energy

The fundamental unit which has same power in the dimensional formula of surface tension and viscosity is:

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Mass

Length

Time

None

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

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1 cm

1 mm

10^-6 cm

10^-12 cm

The acceleration 'a' in m/s² of a particle is given by a = 3 t² + 2 t + 2,where 't' is the time if the particle starts out with a velocity v = 2 m/s at t = 0, then the velocity at the end of 2 second is

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12 m/s

24 m/s

18 m/s

36 m/s

Two point charges placed at distance of 20 cm in air repel each other with a certain force.When a dielectric slab of thickness 8 cm and dielectric constant K is introduced between these point charges force of interaction becomes half of its previous value Then K is approximately.

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2

4

√2

1

The temperature at which the speed of sound becomes double as was at 27°C is

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273°C

0°C

927°C

1027°C

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

A person standing near the track of a fast moving train has tendency to fall towards it because of

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Vibration due to motion of train

Gravitation force of attraction between person and trains

The high speed of train

Some other effect

One cannot see through fog because

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Fog absorbs light

The refractive index of fog is infinity

Light suffers total reflection at the droplet in a fog

Light is scattered by the droplets in fog

For obtaining appreciable extension the wire should be

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Short and thin

Long and thin

Short and tick

Long and thick

Band spectrum in produced by

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H

He

H₂

Na

The frequency of the incident light falling on a photosensitive metal plate is doubled the kinetic energy of the emitted photoelectrons is

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Double the earlier value

Unchanged

More than doubled

Less than doubled

For production of beats the two sources must have

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Different frequencies and same amplitude

Different frequencies

Different frequencies same amplitude and same phase

Different frequencies and same phase.

The essential distinction between X-rays andγ-rays is that

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γ-rays have smaller wavelength than X-rays

γ-rays emanate from nucleus while X-rays emanate from outer part of the atom

γ-rays have greater ionizing power than X-rays

γ-rays are more penetrating than X-rays

To explain his theory Bohr used

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Conservation of linear momentum

Conservation of angular momentum

Conservation of quantum frequency

Conservation of energy

Choose the correct statement

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Both an ammeter and voltmeter should have small resistance

Both an ammeter and a voltmeter should have large resistance

An ammeter should have large resistance and a voltmeter should have small resistance

An ammeter should have small resistance and a voltmeter should have large resistance

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

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

When boron is added as an impurity to silicon, the resulting material is.

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n type conductor

n type semiconductor

p-type conductor

p-type semiconductor

At 0°K which of the following properties of a gas will be zero?

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Kinetic energy

Potential energy

Vibrational energy

Density

Radio waves of constant amplitude can be generated with

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Rectifier

Filter

FET

oscillator

The volt/metre is the unit of:

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Potential

Work

Force

Electric field intensity

The initial velocity of a body moving along a straight line in 7 m/s. It has a uniform acceleration of 4 m/s². The distance covered by the body in the 5th second of its motion is

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25 m

35 m

50 m

85 m

The incorrect statement regarding the lines of force of the magnetic field B is

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Magnetic intensity is a measure of lines of force passing through unit area held normal to it

Magnetic lines of force form a close curve

Inside a magnet, its magnetic lines of force move from north pole of a magnet towards its south pole

Due to a magnet magnetic lines of force never cut each other

When the length of a microscope tube increases, its magnifying power

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Decreases

Increases

May increases or decreases depending on the observer and the place of observation

Does not change

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

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

In Which case does the potential energy decreases?

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On compressing a spring

On stretching a spring

One moving a body against gravitational force

One the rising of an air bubble in water

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