Question # 1

The light energy travels in space as waves was firstly proposed by

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Maxwell

Young

Einsten

Hydrogen

A gas performs 10 J of work while expanding adiabatically. the change in its internal energy is.

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10 J

-10 J

100 J

-200 J

1 KWh =

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3.6 x 10³K

3.6 x 10⁶K

3.6 x 10⁹J

3.6 x 10¹²J

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

In case the work done in zero.

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Constant pressure

Constant volume

Constant temperature

Constant mass

A communication satellite is used ot reflect the signal of.

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Microwaves

Radio waves

y rays

x -rays

The magnifying power of a convex lens of focal lendth 10 cm is

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7

9.6

11

3.5

Close orbiting satellites orbit the earth at a height of about

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400 km

4000 km

400 m

400 cm

In stationary waves, the velocity of particle at the node is.

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Maximum

Infinite

Zero

Varible

Newton's rings are formed due to phenomenon of.

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Interference

Dispersion

Diffraction

Polarization

__ will travel faster than other through an optical fibre.

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Ultraviolet light

Visible light

Infrared light

White light

With increase of temperature, speed of sound.

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Remains constant

Becomes zero

Decreases

Increases

X-ray diffraction has been very useful in determining the structure of

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Hemoglobin

Stars

Galaxies

Stones

Two tunign forks of frequencies 260 Hz and 256 Hz are sounded together , the number of beats per second is.

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2

258

516

4

1 torr in Nm-2 is expressed as.

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130.5 Nm-2

133.3 N m-2

140.2 Nm-2

135.2 Nm-2

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Temperature of a gas is increased from 27 oC to 127 oC. The ratio of its mean K.E. will be

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3/4

9/16

4/3

10/9

A ball is thrown up vertically, it takes 3 sec to reach maximum height. Its initial velocity is.

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10 ms-1

12.2 ms-1

15 ms-1

29.4 ms-1

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