Question # 1

The half life of uranium-238 is

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6.2 x 10⁹years

4.5 x 10⁹days

4.5 x 10⁹years

1.3 x 10⁶years

Diameter of the atom is of the order of

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10^-10m

10^-12m

10^-15m

10^-9m

The minimum wavelength of X-rays produced of 1KV potential difference is applied across the anode and cathode of the tube is

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1.24 x 10^-10m

7.92 x 10^-20m

2.78 x 10^-14m

3.88 x 10^-11m

Radioactivity was discovered by

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Rutherford

Henri Becqureal

Maxwell

James Chadwick

According to Stoke's law, drag force depends on

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Initial velocity

Final velocity

Terminal velocity

Instantaneous velocity

To and fro motion of a body is about its mean position is known as:

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Translatory motion

Vibratory motion

Rotatory motion

None of these

Change in momentum is one second called.

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Impulse

Force

Energy

Work

The photocopying process is called:

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Geography

Sonography

Xerography

Zerography

None of these

The waves which propagate out in space due to oscillation of electric and magnetic fields are known as

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e.m. waves

mechanical waves

sound waves

water waves

When there is no internal frictional forces between the adjacent layers of fluid, then the fluid is called

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incompressible

compressible

viscous

non viscous

The combined effect of resistance and reactance in a.c. circuit is called

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conductance

resistance

impedance

choke

Sharks due to their special organs, the "ampulae of lorenzini due to which they can detect the potential difference and can locate their prey very precisely of the order of

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Volt

Milli volt

Micro volt

Nano volt

Brownian motion confirms the truth of :

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Wave theory of light

Boyle's law

Kinetic theory of gases

Adiabatic process

For obtaining appreciable extension,the wire should be:

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Short and thin

Long and thin

Short and tick

Long and thick

The maximum drag force on a falling sphere is 9.8 N, its weight is

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1 N

9.8 N

4.9 N

None of these

The energy stored in a dam is

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Kinetic energy

Electrical energy

Potential energy

None of these

A body is dropped from a tower with zero velocity reaches ground in 4 seconds.The height of tower is about

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80 m

20 m

160 m

40 m

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The image of an object 5 mm length is only 1 cm high. The magnification of the lens is

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1

0.2

2

0.1

For a circular orbit, the satellite has speed of

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20,000 kmh^-1

25,000 kmh^-1

26,000 kmh^-1

27,000 kmh^-1

The distance between the two adjacent slits is called

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Thickness of the slit

Distance between and two slits

Grating element

None of these

The discuss used by athletes has a mass of 1 kg, its weight in newtons is

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9.8 N

80 N

98 N

100 N

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