Question # 1

When sound waves enter in different medium, the quantity that remains unchanged is.

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Intensity

Speed

Frequency

Wave length

The subtraction of a vector is equivalent to the addition with

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Same direction

Perpendicular direction

Reversed direction

All of these

Bending of light around the edges of an obstacle is called.

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Refraction

Polarization

Interference

Diffraction

On loading the prong of a tuning fork with wax, the frequency of sound.

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Increases

Decreases

Remains same

First increases then decrease

A convex lens acts as diverging lens if the object is placed at

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F

2F

Between F and 2 F

Within the F

A ball is thrown up with 20 ms-1 at an angle of 60 ^owith x-axis , the velocity of the ball at the top position is.

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0 ms-1

10 ms-1

20 ms-1

16 ms-1

The direction of angular velocity is determined.

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Left hands rule

Head to tail rule

Right hand rule

General rule

The word Fluid means

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To rise

To fall

To flow

To oppose

If the object is at 5 cm from the lens of simple microscope than its magnifying power will be.

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5

10

15

25

Bunsen burner works on the principle of.

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Venturi effect

Terricilli's effect

Bernoulli's effect

None of these

The work done by centripetal force is

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(-)ve

(+)ve

Maximum

Zero

Minimum number of unequal forces whose vector sum can be zero are.

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5

4

3

2

If 332 waves pass through a medium in 1 second with speed of 332 ms-1 then wavelength will be

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7 m

332 m

664 m

1 m

The final image seen through ey piece in telescope is.

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Real, enlarge and inverted

Vertual, enlarge and erect

Virtual, enlarge and inverted

In Real, enlarge and erect

In young's double slit experiment for the interference the central region will be

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Dark

Bright

Coloured

None of these

The diastolic pressure of a normal healthy person is.

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120 torr

110 torr

100 torr

75-80 torr

Which one of the following can not be polarized.

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Ultra violet rays

Radio waves

T.V. Waves

Sound waves

Frequency 'f' and time period 'T' are related as

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