Question # 1

Physics is one of the branches of:

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Social sciences

Physical sciences

Biological sciences

Abstract art

The excess (equal in number) of electrons that must be placed on each of two small spheres spaced 3 cm apart, with force of repulsion between the spheres to be 10^-19N, is

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25

225

625

1250

Tick the series which lies in the visible region:

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Lyman series

Balmer series

Paschen series

Brackett series

P fund series

Resistance of a conductor is increased, the currant will

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Decrease

Increase

Remain the same

None of these

Peak value of alternative current is:

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one of its Instantaneous value

Equal to its RMS value

The same as its peak-to-peak value

Both (B) and (C)

None of these

The relation between the charge Q of a parallel plate capacitor and the P.D between its plates is

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Q=V/C

Q=C/V

Q=1/2CV

Q=CV

The alternative voltage of current is actually measured by:

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Its RMS value

Square root of its mean square value

Instantaneous value

Peak value

Both (A) and (B)

When the magnitude of two component vectors are equal to that of their resultant, then the angle between the components is:

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60°

90°

120°

150°

If 'V' is the relativistic speed and 'C' is the speed of light then according to Einstien the factor V/C must always be

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Equal to 1

Less than 1

Greater than 1

Infinity

Transmitting antenna emits

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Magnetic waves

Electric waves

Electromagnetic waves

Sound waves

The nucleous of uranium -235 differs from a nucleous of a uranium -238 in that the later contains

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3 more neutrons

3 more electrons

3 more protons

3 more ions

Total mass when silver coins are added to box as 2.2 kg, 0.01001 Kg and 0.01002 Kg correct to appropriate precision

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2.3 Kg

2.2 Kg

2.43 Kg

2.67 Kg

Sun has elliptical shape when it rises and sets due to

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Refraction

Reflection

Scattering

Dispersion

If the direction of the applied force is reversed then

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Its torque remain unchanged

The magnitude of its torque changes and direction of the torque remains the same

The magnitude of its torque remains the same but the direction of the torque reverses

Torque is also reversed

The ability of the body to return to its original shape is called

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deformation

stretching

compressing

elasticity

Age of the Universe is

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5 × 10¹⁵ sec

5 × 10¹⁷ sec

5 × 10¹⁹ sec

None of these

A single step index fibre can carry more than

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14 TV channels

14,000 phone calls

16 TV channels

a and b

If force of friction is negligible, then acceleration of two free falling objects of different masses is

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The same

Different

Smaller mass has smaller acceleration

None of these

The power of a pump motor is 2 kilowatt.The water raised by the pump per minute to a height of 10 m is nearly

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500 kg

7000 kg

1200 kg

Zero

Which one is ferromagnetic

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Ferries

Cobalt

Nickel

All

In which case application of angular velocity is useful?

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When a body is rotating

When velocity of body is in a straight line

When velocity is in a straight line

None of these

Five equal forces of 10N each are applied at one point and all are lying in one plane.If the angles between them are equal,the resultant force will be:

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Zero

10 N

20 N

10 √2 N

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