Question # 1

Which of the following is/are example/s if mechanical waves i.e. waves generated in _______:

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Rope

Coil of spring

Water

All of them

In an adiabatic expansion, the temperature of the gas

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increases

becomes zero

decreases

decreases rapidly

The Phenomenon of generation of induced emf is called

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Electrostatic induction

Magnetic induction

Electromagnetic induction

Electric induction

Both A and B

Heat required to raise the temperature of one mole of a gas through 1 K at constant pressure is called

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heat capacity

specific heat capacity

specific heat at constant volume

specific heat at constant pressure

To hear a clear echo, the reflecting surface must be at a minimum distance of

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10 m

16.5 m

33 m

66 m

A convex lens acts as diverging lens when the object is placed:

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Between F and 2F

At 2F

With focal length

Beyond 2F

The basis to define a temperature scale that is independent of material properties is provided by

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carbon cycle

nitrogen cycle

Carnot cycle

irreversible cycle

The bob of a simple pendulum is suspended by

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string

heavy inextensible string

light extensible string

light inextensible string

Which of the following does not have the same units:

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Work

Heat

Kinetic energy

Power

A p-n junction is formed when a crystal of silicon is growth in such a way that its one half is doped with trivalent impurity and the other half with a impurity from

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2nd group

fourth group

fifth group

sixth group

The effect of applying a force on a moving body is to change

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its direction of motion only

its speed of motion only

both the direction and speed of motion

its inertia only

A galvanometer is an instrument used to

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measure voltage across a circuit

detect current in a circuit

measure current flowing through a circuit

none of these

The velocity of a body at any instant of its motion is known as

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average velocity

instantaneous velocity

uniform velocity

none of them

If v is the velocity of flow of liquid through a tube of area of cross-section A, then according to equation of continuity

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v/A = constant

A/v = constant

Av = constant

None

The pattern of NaCl particles have a shape which is :

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Cubic

Body centred cubic

Simple cubic

face centred

Both (A) and (C)

A 5 kg mass is falling freely, the force acting on, it will be

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19.6 N

9.8 N

5 N

Zero

In a moving coil galvanometer, the deflecting couple depends upon

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area of the coil

number of turns of coil

value of magnetic field

all of the above

The quantity having the same unit as that of emf is:

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Force

Energy

Potential

Current

Charge

We cannot utilize the heat contents of oceans and atmosphere because

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there is no reservoir at the same temperature

there is no reservoir at the temperature lower than any one of two

there is no reservoir at the temperature higher than any one of two

none of them

When some compass needles are placed on a card board along a circle with the center at the wire, they will

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Point the direction of N-S

Set themselves tangential to the circle

Point in the direction of E-W

None of these

Point in direction of S-E

Hydrogen atom with only one proton in its nucleus, and one electron in its orbit is called

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deuteron

deterium

protium

tritium

Compton studied the scattering of x-rays by loosely bound electrons from:

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NaCl crystal

Graphite crystal

Zirconia

Copper crystal

None of these

The restoring force always directed towards the

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extreme position

mean position

both of them

none of them

A body of mass 5 kg is acted upon by a total change n momentum will be:

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10 NS

100 NS

140 NS

200 NS

Blood has a density

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Equal to water

Greater then water

Lesser then water

None of these

If water rises 4 cm in a long, thin tube because of capillary action, then, under corresponding conditions of use, the rise (in the tube) of a liquid whose density is 2 g/cm²will be

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1 cm

2 cm

8 cm

None

A boat of mass 40 kg is at rest, A dog of mass 4 kg moves in the boat with a velocity of 10 m/s. What is the velocity of boat?

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4 m/s

2 m/s

8 m/s

1 m/s

Lens's law deals with the

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Magnitude of induced current

Magnitude of induced e.m.f

Direction of induced e.m.f

Direction of induced current

A ball is dropped downwards After 1 second another ball is dropped downwards from the same point. What is the distance between them after 3 seconds

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25 m

20 m

50 m

9.8 m

The current that flows through the coil of a motor causes

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Its shaft to revolve

Its brushes to rotate

Motor to move

Its shaft to rotate

None of these

When a constant potential difference is applied across the conductor, the drift velocity of electrons:

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Increases

Decreases

Remains the constant

Either of these

None of these

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