Question # 1

The point through which rays of light pass after reflection from concave mirror is called principal:

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Focus

Circle

Axis

Radius

Bats can hear sound of frequency up to:

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100,000Hz

25000Hz

120, 000Hz

1000Hz

A converging mirror with a radius of 20 cm creates a real image 30 cm from the mirror. What is the object distance?

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5.0 cm

7.5 cm

15 cm

20 cm

When a uranium (92 protons) ejects a beta particle, how many protons are left in the remaining nucleus?

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92 protons

91 protons

93 protons

89 protons

Diffraction of wave can be observed clearly only when the size of slit or obstacle is nearly__________ to the wavelength of the wave:

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Two times

Equal

Four times

None of these

How does sound travel from its source to your ear?

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Byc changes in air pressure

By vibration in wires or strings

By electromagnetic waves

By infrared waves

The loudness of sound is most closely related to its:

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Freqeucy

Period

Wavelength

Amplitude

It mass of bob o a simple pendulum is doubled, its time period.

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is doubled

become four times

remains same

none of the above

How Galvanometer is connected in circuit to detect current?

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In Series

In Parallel

Fixed

Variable

The focal length is related to radius of curvature by the formula:

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f = 2R

f = 4R

f = R/2

R = f/2

As the temperature of a conductor rises, its resistance.

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Increase

Decrease

Does not change

None of these

Specific resistance of copper is ____________ x 10^-8Ohm-meter

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1.62

1.69

5.25

2.75

The waves, which are used to detect the broken bones, are called:

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Light waves

x-rays

Sound waves

both b,c,

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