Question # 1

A heavily damped system has a fairly

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sharp resonance curve

flat resonance curve

both of them

none of them

How many isotopes of helium are present?

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1

2

3

4

Certain charge +q is placed at the center of a sphere. At each of the sphere,The directions of electric intensity and vector area are:

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Same

Different

Opposite to each other

At 60º with each other

Both (B) and (C)

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

It is possible to recognize a person by hearing his voice even if he is hidden behind a solid wall. This is due to the fact that his voice

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Has a definite pitch

Has a definite quality

Has a definite capacity

Can penetrate the wall

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

Through which character we can distinguish the light waves from sound waves

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Interference

Refraction

Polarization

Reflection

In a transistor, if the central region is p-type then this type of transistor is known as

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p-n-p transistor

n-p-n transistor

either of these

none of these

Acceleration of a body at any particular instant during its motion is known as

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average acceleration

uniform acceleration

instantaneous acceleration

all of them

A solenoid is a coil of wire which is:

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Short, loosely wound, cylindrical

Long, tightly wound, spherical

Long, loosely wound, cylindrical

Long, tightly wound, cylindrical

None of these

First law of thermodynamics tells us that heat energy can be converted into equivalent amount of work, but it is silent about

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how heat is absorbed

how heat extracted

how this conversion takes place

none of them

The SI units of acceleration is

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LT

LT^-1

LT^-2

L²T^-2

The approximate efficiency of liquid fuel rocket is

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49%

50%

48%

47%

Three bodies are of masses m₁= 2.2 kg, m₂ = 10.02 g and m₃ = 10.01 g, the sum of their masses up to the appropriate is

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2.2 kg

2.203 kg

2.023 kg

2.0202 kg

How large a force is required to accelerate a body of weight 5 N with 4 ms^-2 is

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10 N

5 N

2 N

1 N

The decrease in potential energy of a ball of mass 20 kg which falls from a height 50 cm is:

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968 J

98 J

1980 J

None of these

The solids which have structure in between order and disorder are called

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amorphous solids

polymeric solids

crystalline solids

all of them

A 1500 kg car has its velocity reduced from 20 ms^-1 to 15 ms^-1 in 3.0 S. How large was the average retarding force

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- 4.5 KN

- 2.5 KN

- 3.7 KN

- 4.3 KN

Substances which undergo plastic deformation until they break, are known as

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brittle substances

ductile substances

plastic substances

neither of them

Motion of a paratrooper is an example of

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motion

rest

static equilibrium

dynamic equilibrium

The value of Boltzman constant is

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1.28 x 10^-22JK^-1

1.38 x 10^-23JK^-1

1.38 x 10^-28JK^-1

1.35 x 10^-29JK^-1

The force of friction that comes into action after the motion has started is called

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Limiting friction

Static friction

Friction

None of these

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