Question # 1

The maximum velocity necessary to put a satellite into orbit is

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7.1 kms-1

7.3 kms-1

7.9 kms-1

8,9 kms-1

The focal length of a concave lens is always

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+ve

-ve

Zero

None of these

The number of significant figures with the increases degree of approximation

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Decreases

Increases

Remains unchanged

None of these

The frictional effect between the different layers of fluid is called

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Terminal velocity

Stock's law

Viscosity

Surface tension

The terminal velocity of a droplet falling down under gravity is directly proportional to the square of

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Its density

Its radius

Its viscosity

Its elasticity

The magnification of a convex lens of focal length 5 cm is equal to.

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5

6

10

23

The K.E. of bullet of mass 500 gm moving at a speed of 200 ms-1

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250 J

125 J

2500 J

10,000 J

Bright fringes are also called as

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Minima

Maxima

Wave front

Ray of light

If 30 waves per second pass through a medium at a speed 30 ms-1, then the wavelength is.

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30 m

15 m

1 m

28 m

When water falls from tap, its cross sectional area decrease due to.

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Decrease of speed

Increase of speed

Air pressure

Gravity increase

One complete round trip of a vibrating body is called.

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Frequency

Time period

Vibration

Amplitude

The Idea that light is electromagnetic waves was indroduced by

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Maxwell Planck

Newton

Fermi

Crooks

Errors due to incorrect design of a device are called

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Random Error

Systematic Error

Physical Error

None of these

The angular acceleration a =

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An ideal reversible heat engine has

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100% efficiency

Highest efficiency

80%

90%

In red light is used as compare to blue light then fringe spacing.

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Decreases

Remain same

Increases

Becomes zero

The direction of angular velocity is determined.

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Left hands rule

Head to tail rule

Right hand rule

General rule

Work is negative when angle between F and d is

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45^o

₀^o

90^o

180^o

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