Question # 1

Wood, cork, cotton, wool, rubber are the eamples of:

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Conductor

Thermal conductor

Insulator

both a & b

What will be the value of β for a solid for which α has a value of 2 x 10^-5 C^-1

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2 x 10^-5 K^-1

6 x 10^-5 K^-1

8 x 10^-15 K^-1

8 x 10^-5K^-1

According to law of conservation of energy increases in P.E is equal to:

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Increase K.E

Decrease in K.E

Decrease in P.E

None

Standards, of physical quantities were established in .

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1910

1020

1950

1960

The force which keeps a body to move in a circle is called

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Gravitational force

Centripetal force

Centrifugal force

Rotational force

The energy stored in dam is:

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Potential energy

Kinetic energy

Chemical enegy

Nuclear energy

The pressure of liquid is given by

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pg V

pg A

pgh

pg

If the velocity of the body becomes double then its kinetic energy will:

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Remain the same

Become double

Become four times

Become half

Mass is measured by:

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Spring balance

Measuring cylinder

Physical Balance

None of these

Newton's first law of motion is valid only in the absence of:

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Force

Not force

Friction

Momentum

Which of the following is a vector quantity?

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Distance

Power

Speed

Displacement

The true ratio of a transformer is 10. It means:

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Vs = 10Vp

Ns = Np/10

Ns = 10NP

VS= Vp/10

In OR operation inputs are connected as:

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Series

Parallel

Both series or parallel

None of these

A conductor of electric current is:

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Wood

Rubber

Plastic

Copper

A positive electric charge:

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Attracts other positive charge

Repels other positive charge

Attracts a neutral charge

Repels a neutral chage

A device which has two ways communication is:

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Television

Radio

Hard disk

Mobile phone

Which is not a hardware device?

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CPU

Windows

Keyboard

Mouse

The 1st practical electric battery is known as:

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Voltaic

Pile

Voltaic pile

Voltaic cell

When a ray of light enters from denser medium to rare medium, the angle of incidence for which angle of refraction is 90° is called:

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Angle of incidence

Critical angle

Angle of refraction

Angle of deviation

A parallel circuit is also used as a divider for:

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Power

Resistance

Current

Voltage

Human skin, in dry conditions, has a resistance of:

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20,000 ohm

100,000 ohm

30,000 ohm

2000 ohm

In liquids and gases the current is due to the motion of:

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Negative charges

Positive charges

Both positive and negative charges

None of these

Which one is true for isothermal process.

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Q = 0

W = 0

Q = W(D) Delta U = 0

None of these

An oil film on water surface shows colour due to.

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Diffraction

Interference

Polarization

Dispersion

A ray of light shows the direction of propagation of light It is line which is.

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Normal to the wave front

Parallax to the wave front

Opposite to the wave front

Equal to the wave front

A device based upon the thermodynamics property of matter is called.

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Calorimeter

Heat engine

thermometer

Voltmeter

The terminal velocity can be obtained by using

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Newton's law

Stock's law

Guass's law

None of these

The direction of vector in space is specified by

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1- angle

2- angle

3- angle

4 - angle

Light waves emitted from a source spread in

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Specific direction

All direction

Upward direction

None of these

The distinguish between transverse and longitudinal wave_______ is used.

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Refraction

Interference

Diffraction

polarization

Frequency range of hearing of cats is.

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20-20000 Hz

10- 10000 Hz

60-20000 Hz

60-70000 Hz

the velocity of sound is maximum at 20 ^oC in

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Lead

Copper

Glass

Iron

A man of 5000 kg moves with an acceralation of 1 ms-2 force acting on it is.

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5 N

500 N

50 N

5000 N

Lenz's law was given by Heinrich lenz in:

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1894

1904

1854

1834

The force on a charge particle moving parallel to magnetic field is:

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Maximum

Minimum

Zero

None of these

The unit of magnetic induction is:

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Tesla

Weber

Weber metre

NAm^-1

The most suitable metal for making permanent magnet is.

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Iron

Aluminium

Steel

Copper

Logic gate can control some physical parameters like.

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Temperature, Pressure

Resistance, Inductance

Capacitance, Impedance

Current, voltage

Ampere second stands for the unit of.

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Charge

emf

energy

Power

When gama rays are emitted, the nuclear mass.

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Decreases by 4 units

Does not change

Increases by 2 units

Increase by 1 unit

If 1 x 10⁷ electrons passes through a conductor in 1.0 micro second , then the current is.

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2 A

1.6 A

2.6 x 10^-6 A

1.6 x 10^-6 A

If I_o is the peak value of current, then its root mean square value is given by

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2 I_o

I_o

0.7 I_o

GM counter uses

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Alcohol only

Bromine

argon

Neon and bromine

Self inductance of a long solenoid is given by

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None of the above