Question # 1

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

In a Millikan's oil drop experiment the charge on an oil drop is calculated to be 6.35 x 10^-19C. The number of excess electrons on the drop is

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3.9

4

4.2

6

Ultra-violet radiation of 6.2 eV falls on an aluminium surface. K.E. of fastest electron emitted is (Work function = 4.2 eV)

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3.2 x 10-21 J

3.2 x 10-19 J

7 x 10-25 J

9 x 10-32 J

Planck's constant has the dimensions of:

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Energy

Momentum

Frequency

Angular momentum

The part of a transistor which is heavily doped to produce large number of majority carriers is

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Emitter

Base

Collector

Any of the above depending on nature of transistor

Who explained the origin of the Fraunhoffer lines?

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Fraunhoffer

Kirchhoff

Fresnel

Snell

Electrons in the atom are held in the atom due to

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Coulomb forces

Nuclear forces

Gravitational forces

Van der Waal's forces

Two electric bulbs of 200 W and 100 W have same voltage. If R₁and R₂be their resistance respectively then

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R₁=2R₂

R₂=2R₁

R₂=4R₁

R₁=4R₂

In which case application of angular velocity is useful?

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When a body is rotating

When velocity of body is in a straight line

When velocity is in a straight line

None of these

Angular momentum is

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Vector (axial)

Vector (polar)

Scalar

None of these

Quantity that remains unchanged in a transformer is

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Voltage

Current

Frequency

None of these

Absolute temperature can be calculated by

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Mean square velocity

Motion of the molecule

Both A and B

None of these

According to Stoke's law, drag force depends on

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Initial velocity

Final velocity

Terminal velocity

Instantaneous velocity

The primary winding of transformer has 500 turns whereas its secondary has 5000 turns. The primary is connected to an a.c. supply of 20 V, 50 Hz. The secondary will have an output of

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200V, 50 Hz

2V, 50 Hz

200V, 500 Hz

2V, 5 Hz

Steel is preferred for making springs over copper. Why?

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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 ot be oxidized

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°

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