Question # 1

Position was discovered by Carl Anderson in

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1920

1925

1928

1932

The density of blood is nearly equal to that of

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mercury

sodium

water

honey

A massive object falls through a fluid:

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Faster

Slower

Slowest

None

A spring of constant k = 0.4 N m^-1_{is to be extended thorugh 10 cm at a place where g = 10 m sec}^-2. The mass to be suspended should be:

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4 gms

0.4 gms

40 gms

None of these

Which is modified form of galvanometer

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potentiometer

battery

voltmeter

slide wire bridge

The property of fluids due to which they resist their own flow is called:

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Drag force

Surface tension

Viscosity

None of these

When a fluid is in motion, its flow can be considered as

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turbulent

streamline

either or them

neither of them

Which of the following waves are more energetic

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radio waves

infrared waves

ultraviolet

γ-rays

A ball is dropped from a height of 4.2 meters. To what height will take it rise if there is no loss of KE after rebounding?

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4.2 m

8.4 m

12.6 m

none of these

The portion of the water above its mean level forms a:

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Crest

Trough

Both A and B

None of these

A container has a small hole in the bottom. Air can go through this hole,but water cannot. This can be best explained by the statement that

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water contains hydrogen atoms, air does not

water molecules are smaller than molecules in the air

surface tension of the water prevents it from

A body moving along the circumference of a circle of radius R completes one revolution. The radius of a covered path to the angle subtended at the centre is:

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Radius of the circle

Twice the radius

Thrice the radius

None of these

In a transistor, the central region is called

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collector

emitter

base

none of them

A body of mass 5 kg is acted upon by a constant force of 20 n for 7 seconds. The total change in momentum will be:

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10 NS

100 NS

140 NS

200 NS

______ plays the same role during angular motion as played by the mass in linear motion

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Torque

Angular Momentum

Moment of a force

Moment of inertia

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

The electric potential at the surface of an atomic nucleus (Z = 50) of radius 9.0 x 10^-15is

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9 x 10⁵V

9 V

8 x 10⁶V

80 V

The year when A.H. compton was awarded Nobel Prize is:

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1923

1927

1931

1935

None of these

Huygen principle is used to determine:

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Speed of light

Location of wavefront

About polarized or unpolarized light

None of them

Those quantities which can be measured accurately are known as

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Physical Quantities

Scalar Quantities

Vector Quantities

Non Physical Quantities

Static electricity is produced by the transfer of:

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Electrons

Protons

One fluid

Two fluid

None of these

When a vector is multiplied by a negative number, its direction:

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Remains the same

Changes

Changes by 180°

None of these

A transistor has:

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One region

Two regions

Three regions

Four regions

None is correct

One joule is equal to

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1.6 x 10¹⁹eV

6.25 x 10¹⁸eV

1.6 x 18¹⁸eV

6.25 x 10¹⁹eV

Hertz is unit of:

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Time period

Displacement

Amplitude

Frequency

Electron volt is the unit of.

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Potential difference

Energy

Resistance

Capacitance

The free electrons in metals:

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Are in random motion and their speed depends upon temperature

Move in particular direction

Move with speed of light

Move such that their speed does not depend on their temperature

None of these

The number of vibrating body at any instant from its equilibrium position is called

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displacement

frequency

amplitude

time period

A coil of constant area is placed in a constant magnetic field. An induced current is produced in the coil when:

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The coil is distorted

The coil is rotated

The coil is neither distorted nor rotated

Both A and B

None of these

A wire is bent into a ring of radius R is given a charge q. The magnitude of the electrical field at the centre of the ring is

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Two

1/2

Zero

3/2

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

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Double

Half

One third

One fourth

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