Question # 1

The velocity of a free falling body just before Hattin the ground is 9.8 ms-1, the height through which is fall be

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98 m

19.6 m

4.9 m

9.8 m

A force of 100 N makes an angle of 60o with Y- Axis, its horizontal component is.

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50 N

60 N

70.7 N

86.6 N

The final image formed by a simple microscope.

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Virtual and inverted

Real and erected

Virtual and erected

Real and inverted

The temperature scale which is independent of nature of substance is.

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Thermodynamic scale

Centigrade scale

Fahrenheit scale

Regnault scale

The types of optical fibres are

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Three

Four

Five

Six

The speed of sound in ari at 0 ^oC is 332 ms-1, Then the speed at 40 ^oC will be

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372 ms-1

356 ms-1

346 ms-1

332 ms-1

The distance between two consecutive crest is called.

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Displacement

Amplitude

Wave front

Wavelength

In transverse waves the particles of medium vibrate

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Along the direction of wave

Opposite to direction of wave

Perpendicular to direction of wave

Slowly

The density of blood is nearly equal to.

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Air

Milk

Honey

Water

2 radian = ____

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2 m

4 m

57.3 m

114.6 m

The energy processes, we use are

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Efficient

Not efficient

Reversible

None of these

A fog droplets are in freely falling condition,. the ratio of their radii is 2:3, the ratio of their terminal velocities will be.

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2:3

4:6

4:9

9:4

A stationary waves is established din a string which vibrates in four segments at a frequency of 120 Hz, Its fundamental frequency is.

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15 Hz

30 HZ

60 Hz

480 Hz

In order to produce beats, the two sound waves should have.

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The same amplitude

Slightly different amplitude

The same frequency

slightly different frequencies.

Which of the following is evidence of wave nature of light

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Interference

Diffraction

Polarization

All of these

One radian is equal to.

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75.3^o

57.3^o

35.7^o

73.3^o

The velocity of a projectile is maximum

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At the highest point

At point of launching and just before striking the ground

At half of the height

After striking the ground

The SI unit of angular displacement is.

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Degree

Revolution

Radian

Rotation

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