Question # 1

A cylinder resting on its circulr bases is in

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Neurtral equilibrium

Stable equilibrium

Unsatable equilibrium

None of these three

You throw a ,it opens fully underwater, spreading out its mesh evenly.Compared to the moment it left your hand, where in the net\s center of mass now.

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Unchanged from its position when thrown

At the same depth but slightly shifted horizontally

Higher is the water column

Loweer in the water column

Which one of the following is not a magnetic material

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Iron

Nickel

Aluminium

Cobalt

A bullet of mass 0.05 kg has a speed of 300 ms-1. Its kinetic energy will be.

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2250 J

4500 j

1500 J

1125 J

How dow the molecules in a solid behave.

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Move randomly

Move in a stragiht line rom hot to cold ends

Vibrate about their mean position

Rotate and vibrae randomly at their own positions

A lubricant is usually introduced between two surfaces to decresses friction. The lubricant.

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Decreases temperture

Provides rolling friction

Prevents direct contact of the sturaces

Acts as ball bearings

A ball is throuwn straight up, what is the magnitude of acceleration at the top of its path.

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9.8 m/s2

zero

19.6 m/s2

4.9 m/s2

What is the best definitin of the term "theory", as it us used in sciecne.

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A theory is a guess or hunch about somethig that has occurred in nature

A theory is a comprehensive set of ideas explaining a phenomenon in nature

A theory is based on verifiable laws and can be proven true

A theory is a hypothesis that uses laws and observation to make an assumption.

Change in momentum of a body is equal to

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Force Velocity

Force Time

Mass time

Force

Motion of a screw of rotating fan is

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Circular Motion

Vibratory motion

Rotatory motion

Random Motion

When an ideal gas is expanded keeping its temperatur econsitant, its internal energy

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Increases

Remains the same

Decreases

Cannot be determined

Give the number of factors which affect the ability of a capacitor to store charge.

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2

3

4

5

At mean position of pendulum, the potential energy of the pendulum is:

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Maximum

Minimum

Much more

Both a and c

A positive electric charge:

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Attracts other positive charge

Repels other positive charge

Attracts a neutral charge

Repels a neutral chage

For a normal person audible frequency range for sound wave lies between:

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10 Hz and 10kHz

20Hz and 20 kHz

25 Hz and 25 kHz

30Hz and 30 kHz

Release of the energy by the sun is due to:

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Nuclear Fussion

Nuclear Fission

Burning of gases

Chemical reaction

What happens to the intensity of the brightness of the lamps connected in series as more and more lamps are added?

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Increases

Decreases

Remains the same

Can not be predicted

The index of refraction depends on:

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The focal length

The speed of light

the image distance

The object distance

What is the power rating of a lamp connected to a 12 v source when it carries 2.5 A?

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4.8 W

14.5 W

30 W

60 W

Which process is involved to store charge in capacitors:

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Rubbing

Electrostatic induction

Conduction

Electromagnetic induction

Which part of a D.C. motor reverses the direction of current through the coil every half-cycle.

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The armature

The commutator

The burshes

The slip rings

The speed of sound in air at 100°C is:

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380ms-1

382ms-1

386ms-1

300ms-1

The number of significant figures with the increases degree of approximation

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Decreases

Increases

Remains unchanged

None of these

A spring of spring constant 10 N/m after loading that amplitude is 2m. Then the maximum P.E. is

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10 J

20 J

30 J

40 J

For a diatomic gas Cv= 5R/2 then gamma for this gas is.

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5/7

4/35

7/5

35/4

The unit of work in base unit is

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Kg m-1 sec-2

Kgm sec-2

Kgm2 sec-1

Kgm-1 sec-1

The relation between the speed and hoop can be written as

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2

4

1/2

1/4

The acceleration produced by elastic restoring force is

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Perpendicular to force

Opposite to force

In same direction as force

Zero

The increase in thermal pollution of environment means.

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Increase in the entropy

Decrease in the entropy

Entropy remains constant

Entropy becomes zero

3 Joules of work id done is 3 seconds, then power

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6 Watt

1 Watt

3 Watt

2 Watt

When the car moves with an increasing acceleration then its velocity time graph is always

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Constant

Variable

A straight line

A curve

the quantities which are define din term of other physical quantieis are called

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Base Quantities

Derived quantities

Bothe a and b

None of these

Which is the example of vector quantity

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Torque

Speed

Density

Work

The inductive reactance of a coil is direction proportional to.

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Inductance

Resistance

Frequency of A.C.

Both frequency of A.C. and inductance

The unit of permiability of free space is:

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T.m/A

T.m²/A

T.m/A²

None of these

Which of the modulus of elasticity is involved in compressing a rod to decrease its length ?

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Young's modulus

Bulk modulus

Modulus of elasticity

None of these

When meta I is heated sufficiently electrons are given off by the metal. This phenomenon is known as.

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Photoelectric effect

Piezo electric effect

Thermionic emission

Secondary emission

The reciprocal of decay construct lamda of a radioactive element is.

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Half life

Mean life

Curie

total life

High frequency radio wave is called as

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Fluctuate

Carrier wave

Matter wave

Mechanical wave

Platinum wire becomes white at a temperature of.

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1600^oC

1300^oC

1100^oC

900^oC

The solid with definite M.L are called:

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Crystalline

Amorphous

Polymeric

None of above

Conversation of only one half of A.C. into D.C. is called.

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Half wave amplification

Wave amplification

Half wave electrification

Half wave rectification

Resistivity at a given temperature depends upon.

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Area of cross section

Length

Nature of material of conductor

Both length and area

Energy stored in inductor is.

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1/2 L I²

1/2 LI

1/2 L2I

1/2 L2I2