Question # 1

An object undergoes S.H.M has maximum speed when its displacement from the mean position is

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maximum

zero

half of the maximum value

one third of the maximum value

The maximum stress that a material can withstand, is known as

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plastic point

elastic limit

yield point

ultimate tensile strength

The direction of a vector in space requires:

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X-axis

X and Y-axes

XYZ axes

Y and Z-axes

The unit of decay constant is:

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Second

Metre

Hour

Year

Second^-1

The charge carriers in gases are

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electrons

ions

protons

ions and electrons

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

An object moving through a fluid experiences a retarding force called a

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frictional force

terminal force

opposing force

drag force

If the distance between two charges is doubled, the force between them will become

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Double

Half

Three times

One fourth

One third

Davision and Germer performed experiment to verify

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de-Brogile hypothesis

theory of relativity

Newton's law of gravitation

Mass-energy relation

The value of current gain of n-p-n transistor is of the order of

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tens

hundreds

thousands

ten thousands

A typical rocket consists of fuel

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more than 60% of launch mass

less than 60% of launch mass

less than 80% of launch mass

more than 80% of launch mass

Which of the following pairs does not have identical dimensions?

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Torque and energy

Energy and work

Momentum and impulse

Mass and moment of inertia

Cosine of an angle is positive in:

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2nd quadrant

3rd quadrant

4th quadrant

All of these

In above figures, tell which set of graphs shows that a body is moving with uniform velocity:

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(i) and (ii)

(ii) and (iii)

(iii) and (iv)

The body oscillates due to ______ accelerates and overshoots the rest position due to _______

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Applied force, Inertia

Restoring force, Friction

Frictional force, Inertia

Restoring force, Inertia

The term Brownian movement refers to

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irregular motions of small particles suspended in a fluid

convection currents in a liquid or gas

convection currents in a gas but not in a liquid

the stretching of a body beyond its elastic limit

Rate of change of momentum is called

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Impulse

Force

Torque

Momentum

Which type of wave can be set up in solids

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longitudinal waves

transverse waves

both of them

none of them

Transformer is used to

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Increase alternating current

Increase d.c voltage

Increase & Decrease emf

All answers are right

Due to the high value of the input resistance, practically, the value of the current which flows between the input terminals is

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zero

small

large

very large

Coulomb force, when any material medium is placed between two charges

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Increases

Decreases

Remain unchanged

None of these

The rear wheels of an automobile are rev/sec which is reduced to 38 rad/sec in 5 seconds when brakes are applied. Its angular acceleration is:

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5 rad/sec²

-10 rav/sec²

-10 rad/sec²

-5 rav/sec²

The phase at the positive peak of an A.C. cycle is:

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0º

90º

180º

0 andᏘ

Ꮨ/2 and 3Ꮨ/2

According to kinetic theory of gases, molecules of a gas behave like

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Inelastic spheres

Perfectly elastic rigid sphere

Perfectly elastic non-rigid spheres

Inelastic non-rigid spheres

The reverse saturation current in a PN junction diode is only due to

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Majority carriers

Minority Carriers

Acceptor ions

Donor ions

When velocity of moving body is doubled, the quantity which is also doubled is its:

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K.E.

Acceleration

Momentum

P.E.

A conducting wire is drawn to double its length. Final resistivity of the material will be

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Double of the original one

Half of the original one

One fourth of the original one

Same as original one

If the length of second pendulum becomes four times then its time period will become

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Four time

Two times

Six times

Eight times

The energy stored in a charge capacitor

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1/2CV²

1/2C²V

1/2C/V²

None of these

Distance traveled by a body falling from rest in the first, second and third second is in the ration of

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1 : 2 : 3

1 : 3 : 5

1 : 4 : 9

None of the above

Significant figures in 0.2020 are:

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Two

Three

Four

Five

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