Question # 1

The body of physics involves

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Structure of space and time

Interaction of electromagnetic radiation with matter

Both of them

Chemical Changes

The unit of flux density is also given by

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Weber/m²or Wb . m^-2

Weber/mor Wb . m

Weber/mor Wb . m^-1

Weber or Wb

A stone is dropped from rest from the top of a tower 19.6 m high. The distance traveled during the last second of its fall is (giving g=9.8 m/s^s)

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9.8 m

14.7 m

4.9 m

19.6 m

The force acting on a charge moving in a magnetic field

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is perpendicular to the both magnetic field and direction of motion

is proportional to the magnetic of charges

vanishes when the motion is directly opposite to the direction of field

all of the above

When the pn-junction is in reversed biased, current flows through the junction due to the

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majority carriers

minority carriers

either of them

none of them

The interior of a hollow charged metal sphere is a region which:

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Contain some magnitude of electric field

Is full of electric field lines

Is field-free region

Either (A) or (B)

None of these

The path (or trajectory) described by a projectile is

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a parabola

a hyperbola

a circle

a straight line

Least distance of distinct vision of an old man possibly becomes:

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A little less than 25 cm

A little more than 25 cm

Much less than 25 cm

None of these

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

In the equilibrium state, the potential difference between two ends of the conductor moving across a magnetic field is called:

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Motion emf

Electrostatic emf

Induced emf

Both A and B

Both A and C

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

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displacement

frequency

amplitude

time period

Two forces each of 10 N act on a body, if the force are inclined at 30° and 60° respectively with x-axis, then x-component of their resultant is:

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20 N

13.66 N

10 N

8.66 N

The figure 1.007276μ shows the mass of an:

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Atom

Positron

Electron

Neutron

Proton

A hole in p-type my be due to:

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Trivalent impurity

Breking of some covalent bond

Pentavalent impurity

Germanium

Either (A) or (B)

The vibrations of factory floor caused by the running of heavy machinery is an example of

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free vibration

natural vibrations

forced vibrations

all of them

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

Associated with the motion of a driven harmonic oscillator, there is a very striking phenomenon, know as

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waves

beat

interference

resonance

Which of the following is not an example of intertial frame

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a body placed on the surface of earth

a body placed in a car moving with uniform velocity

a body placed in a car moving with same acceleration

none of these

Crests and troughs are formed in:

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Longitudinal waves

Transverse waves

Both of these

None of these

Photoelectrons are emitted when ultraviolet light falls on:

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Casium

Silver

Potassium

Any of these

None of these

Flux through a closed surface of any shape and flux through the surface of a sphere drawn around a charge are:

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Different

Same

Such that it is greater in the first case

Such that it is greater in the second case

None of these

The electric flux is linked with a surface will be maximum when

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The surface is held parallel to the electric field

The surface is held perpendicular to the electric field

The surface makes an angle of 45° with the electric field

All of the above

Melting point of ice

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Increases with increasing pressure

Decreases with increasing pressure

Is independent of pressure

Is proportional to pressure

If force and displacement are in opposite direction, the work done is taken as:

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Positive work

Negative work

Zero work

Infinte work

Calculate the amount of charge flowing in 2 minutes in a wire of resistance 10Ωwhen a potential difference of 20 V is applied between its ends

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120 C

240 C

20 C

4 C

A curie represents a very strong source of

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α-particle

β-particle

γ-particle

none of these

Which of the following is an example of SHM(in ideal situations)

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Motion of simple pendulum

Motion of horizontal spring man system

Motion of violin string

All of these

The number of all the protons and neutrons in a nucleus is known as

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atomic number

mass number

charge number

none of these

A hollow insulated conduction sphere is given a positive charge of 10μC. What will be the electric field at the centre of the sphere if its radius is 2 meters?

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Zero

5μC m^-2

20μC m^-2

8μC m^-2

The induced current in the loop can be increased by:

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Using a stronger magnetic field

Moving the loop faster

Replacing the loop by a coil of many turns

All above

Both (A) and (B)

When the different streamlines cannot cross each other, then this condition is known as

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continuity condition

turbulent flow condition

steady flow condition

none of them

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