Question # 1

If a ray of light is glass is incident on an air surface at an angle greater than the critical angle, the ray will.

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refract only

reflect only

partially refract and partially reflect

Diffract only

The speed of sound in air at 21 °C is:

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336ms^-1

343ms^-1

430ms^-1

470ms^-1

the waves have properties:

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reflection

refraction

diffraction

all of these

The force applied on the mass attached with a spring is represented by:

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F_a

F_c

F_ext

F_s

A digital multimeter is used to measure:

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Current

Resistance

Potential difference

All of above

Transformer which increase voltage is called.

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Step-up transformer

Step down transformer

D.C.Moter

A.C.genrator

If the distance between the charged bodies is much greater as compared to their sizes then the bodies are considered is:

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Positive charge

Negative charge

Point charge

Zero charge

Image formed on a camera is:

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real,invertred, and diminished

virtual, upright and diminshed

virtual, upright and magnified

real, inverted and magnified

Astronauts is space need to communicate with each other by radio links because:

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Sound waves travel very slowly in space.

Sound waves travel very fast in speace

Sound waves cannot travel in space

Sound waves have low frequency in space

Safe level of noise depends on factors:

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One

Two

Three

Four

The output of a NAND gate is 0 when

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Both of its inputs are 0

Both of its inputs are 1

any of its inputs is 0

any of its inputs is 1

The refractive index of air is:

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6

7

2

1,0003

In totally reflecting prism one angle is of:

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45°

90°

180°

120°

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