Question # 1

The size of the image is maximum when its distance from the magnifying glass is:

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0.10 m

0.15 m

0.20 m

0.25 m

If a gymnast sitting on a rotating stool with his arms outstretched, brings his arms towards the chest, then its angular velocity will

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Increase

Decrease

Remain constant

None of these

When the conductor moved across a magnetic field:

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Emf induced is similar to that of a battery

Emf induced gives rise to induced current

An emf induced across its ends

All are correct

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

Brownian motion increases due to

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Increase in size of Brownian particle

Increase in temperature of medium

Increase in density of medium

Increase in viscosity of medium

The velocity of sound is greatest in

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Water

Air

Vacuum

Metal

In full wave rectification, simultaneous action is that:

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Two diodes conduct and two do not.

One diode conduct and three do not.

Three diodes conduct and one does not.

All the four diodes conduct

None of these

Inertial frame of references are those frame of references which are moving with

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increasing velocity

decreasing velocity

constant velocity

all of them

A point charge A of charge +4μC and another B of charge -1μC are placed in air at a distance 1 m apart. Then the distance of the point on the line joining the charge B, where the resultant electric field is zero, is (in m)

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2

1

0.5

1.5

The phenomenon of generation of induced emf is called

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Electrostatic induction

Magnetic induction

Electromagnetic induction

Electric induction

Both (A) and (D)

The mass of the nucleus is always less than the total man of the protons and neutron that make up the nucleus. The difference of the two masses is called

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nuclear fission

nuclear fusion

man defect

radioactivity

How many phone calls can be carried by single mode step index fibre

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25000

96000

14000

21000

An electric fan rotating in 3 revs^-1 is switched off. It come sot rest in 18.0 sec. Find the value of acceleration which is

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+ 1.267 revs^-2

0027 revs^-2

- 0.167 revs^-2

- 0.152 revs^-2

If momentum is increased by 20% then K.E. increases by

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44%

55%

66%

77%

What is the S.I. unit of dipole moment ?

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cm

cm²

cm^-1

cm^-2

The minimum energy required by an electron to eject from metal surface is known as:

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Photo energy

Critical energy

Threshold energy

Work function

A body is said to be in a state of complete equilibrium if

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Its translational accelerationis zero

Its rotational acceleration is zero

its rotational as well as translational acceleration is zero

its angular momentum is zero

A device which is based upon the thermodynamic property of matter is

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Thermometer

Thermo state

Heat engine

Calorimeter

How many ways vector can be represented

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Bold letter

Arrow over capital letter

Graphically

All ow them

Uniform acceleration is defined as

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Average acceleration

Instantaneous acceleration

Equal change in velocity and time

None of these

Which row is correct for fission and for fusion?

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Produces larger nuclei

Produces smaller nuclei

The three equation of motion are useful only for

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linear motion with increasing acceleration

linear motion with uniform acceleration

linear motion with zero acceleration

linear motion with varying acceleration

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