Question # 1

The speed of sound was accurately measured in:

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1736

1737

1738

1739

Two uncharged objects A and B are rubbed against each other. When object B is placed near a negatively charged object C, the two objects repel each other. Which of these statements is true about object A.

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Remains uncharged

Becomes positively charged

Becomes negatively charged

Unpredicatable

When an electric current passes through a conductor, which field is produced around it?

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Electric field

Magnetic field

Gravitational field

Electrostatic field

Power of convex lens is 10 D. Its focal length is:

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100 m

10 m

1 m

0.1 m

Bats can hear sound of frequency up to:

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100,000Hz

25000Hz

120, 000Hz

1000Hz

In electric motor, the brushes are made of:

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Lead

Graphite

Iron

Wood

By keeping resistance constant if we double the voltage then current will be:

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Double

4 times

¼ times

Half

Angle opposite to the base of triangle of prism is called:

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angle of incidence

angle of refraction

angle of prism

emerging angle

When the object is placed beyond 2F of a convex lens, the image formed will be:

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Real, inverted and smaller than the object

Real, inverted and of the same size as the object

Real, inverted and larger in size than the object

Virtual, erect and larger in size than the object

How Galvanometer is connected in circuit to detect current?

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In Series

In Parallel

Fixed

Variable

Ripple tank is an instrument which is used to study the characteristics of:

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Mechanical waves

Light waves

Radio waves

Electro-magnet waves

What is the power rating of a lamp connected to a 12 v source when it carries 2.5 A?

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4.8 W

14.5 W

30 W

60 W

The time period of frequency and time period is equal to:

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v

1

0

λ

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