Question # 1

A capacitor acts as an infinite resistance for

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AC

DC

Both AC and DC

Relation between pressure (P) and energy (E) of a gas is

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P = 2/3 E

P = 1/3 E

P = 3/2 E

P = 3 E

In a common base transistor circuit the current gain is 0.98.On changing the emitter current by 5.00 mA, the change in collector current is:

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0.196 mA

2.45 mA

4.9 mA

5.1 mA

Bernoulli's equation is based upon law of conservation

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Mass

Momentum

Energy

None of these

Two point charge +3μC and +8μC repel each other with a force of 40 N. if a charge of -5μC is added to each of them then the force between will become

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-10N

+10N

+20N

-20N

Copper and germanium are cooled to 70 K from room temperature then

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Resistance of copper increases while that of germanium decreases

Resistance of copper decreases while that of germanium increases

Resistance of both decreases

Resistance of both increases

Shunt required in an ammeter of resistance R to decrease its deflection from 30 ampere to 10 ampere is

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R/4

R/3

R/2

R

In an L-R circuit time constant is that time in which current grows from zero to the value

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0.63 I_o

0.50 I_o

0.73 I_o

I_o

A point charge Q is placed at the mid-point of a line joining two charges 4q and q. if the net force on charge q is zero. then Q must be equal to

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-q

+q

-2q

+4q

A body of mass 2 kg is thrown up vertically with K.E of 490 joules If the acceleration due to gravity is 9.8 m/s² the height at which the K.E of the body becomes half its original value is give by:

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50 m

12.5 m

25 m

10 m

Band spectrum in produced by

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H

He

H₂

Na

Ultra-violet radiation of 6.2 eV falls on an aluminium surface. K.E. of fastest electron emitted is (Work function = 4.2 eV)

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3.2 x 10-21 J

3.2 x 10-19 J

7 x 10-25 J

9 x 10-32 J

The initial velocity of a body moving along a straight line in 7 m/s. It has a uniform acceleration of 4 m/s². The distance covered by the body in the 5th second of its motion is

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25 m

35 m

50 m

85 m

Velocity of sound in a diatomic as is 300 m/sec, what is its rms velocity?

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400 m/sec

40 m/sec

430 m/sec

300 m/sec

The unit of electric current 'ampere' is the amount of current flowing through each of two parallel wires 1 m apart and of infinite length will give rise to a force between them equal to

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1 N/m

2 x 10^-7N/m

1 x 10^-2N/m

4 x 10²N/m

A body moves a distance of 10 m along a straight line under the action of a force of 5 Newton's. If the work done is 25 joules, the angle which the force takes with the direction of motion of the body is:

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0°

30°

60°

90°

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

The percentage errors in the measurements of mass and speed are 2% and 3% respectively. How much will be the maximum error in the estimate of the kinetic energy obtained by measuring mass and speed

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11%

8%

5%

1%

The peak voltage in 220 volt A.C. supply is nearly

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220 volt

253 volt

311 volt

440 volt

With the propagation of a longitudinal wave through a material medium, the quantities transmitted in the propagation direction are

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Energy, momentum and mass

Energy

Energy and mass

Energy and linear momentum

To explain his theory Bohr used

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Conservation of linear momentum

Conservation of angular momentum

Conservation of quantum frequency

Conservation of energy

A charge Q is divided into two parts q and Q - q and separated by a distance R. The force of repulsion between them will be maximum when:

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q = Q/4

q = Q/2

q = Q

None of these

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