Question # 1

The nature of capacity of electrostatic capacitor depends on

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Shape

Size

Thickness of plates

Area

In the same medium, velocity of the wave:

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Goes on increasing

Remains constant

Goes on decreasing

None of these

An ordinary glass gradually softens into a 'paste -like' state before it becomes a very viscous liquid. It happens almost at:

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800^oC

500^oC

300^oC

100^oC

None of these

An object thrown upward with an initial velocity at certain angle with the horizontal and moving freely under the action of gravity is called

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a rocket

an aeroplane

a projectile

a ballon

A 220 V, 50 Hz. A.C. source is connected to an inductance of 0.2 H and a resistance of 20 ohm in series. What is the current in the circuit?

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10 A

5 A

33.3 A

3.33 A

The basic circuit element in a d.c. circuit is a/an

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Inductor

Resistor

Capacitor

Battery

In an A.C. circuit, a resistance of R ohm is connected in series with an inductance L. If phase angle between voltage and current be 45°. the value of inductive reactance will be

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R/4

R/2

R

Cannot be found with the given data

Back emf is produced due to

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Self induction

Mutual induction

A.C

Lenz's law

Work is always done on a body when:

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A force acts on it

It moves through certain distance

None of A and B is correct

Both A and B is correct

Which one of the following elasticizes is possessed by fluids:

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Young's elastic modulus (length)

Bulk elastic modulus (volume)

Modulus of rigidity (shape)

None of these

Which one of the following Electro-magnetic wave have the highest frequency and shortest wave-length

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X-rays

Ultraviolet rays

y-rays

Cosmic rays

The first law of thermodynamics defined as

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Conversion of heat energy into mechanical energy

Conversion of heat energy into vibrational energy

Conversion of heat energy into translational energy

All of these

A force of 12 N gives an acceleration of 4 ms^-2 to an object.The force required to give it an acceleration of 10 ms^-2is

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15 N

20 N

25 N

30 N

Unit of solid angle is

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Radian

Degree

Steradian

Revolution

If the velocity-time graph is a straight line, then it is

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parallel to velocity-time

parallel to time axis

inclined to velocity axis

inclined to time-axis

The rain drop falling from the sky reach the ground with

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Constant terminal velocity

Constant gravitational acceleration

Variable acceleration

Acceleration greater than g

If force and displacement of particle in the direction of force are doubled.Work would be

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Double

4 times

Half

1/4 times

If momentum is increased by 20% then K.E. increases by

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44%

55%

66%

77%

The locus of all the points in the same phase of vibration is called:

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Wave packet

Wavefront

Wave number

None of these

Which of the material is brittle ?

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Steel

Low carbon steel

High carbon steel

None of these

Deceleration means the speed of the body is

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Increasing

Decreasing

Just moving

None of these

The energy required to charge a capacitor of 5 μF by connecting D.C source of 20 kV is

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10 kJ

5 kJ

2 KJ

1 kJ

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