Question # 1

The altitude of geostationary orbits in which communication satellites are launched above the surface of the earth is;

Choose an answer

850 km

1000 km

6400 km

42300 km

Co-efficient of friction between iron and iron is:

Choose an answer

1.0

0.62

0.9

1.2

The process in which heat is transfer due to actual movement of molecule is called.

Choose an answer

Conduction

radiation

Convection

All of these

Thermoflask is used maintain:

Choose an answer

Heat

Temperature

Density

Pressure

The gravitational field exist _________ the earth.

Choose an answer

One direction

Upward

All aorund

Downward

If the mass of a body is 'm' and change in its temperature isΔT, then the heat absorbed or released is given by

Choose an answer

ΔQ = cmΔT

ΔQ = mΔT

ΔQ = 2cΔT

ΔQ = cmΔT2

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

Choose an answer

Increase P.E

Decrease P.E

Decrease K.E

None of these

Which one of the following converts light energy into electrical energy:

Choose an answer

Electric Bulb

Electric Generator

Photocell

Electric generator

According to Archimedes principle the density of a substance is determined by using formula

Choose an answer

D = w1/w2 + w1 x p

D = w1w2/w2- w1 x p

D = w1/w2 - w1 x p

D = w1w2/w2- w1 x p

The quantities that describe completely by magnitude and direction are.

Choose an answer

Scalar

Vector

Base

Derived

In Einstein's mass-energy equation c means speed of light. Its value is:

Choose an answer

3 x 10^-8 ms^-1

3 x 10⁸ms^-1

3 x 10⁹ms^-1

3 x 10¹⁸ms^-1

The S.I unit of Spring constant is:

Choose an answer

Nm

N

Nm-1

Ns

If a dielectric medium is present between two point charges them electrostatic force will be:

Choose an answer

Increased

Decreased

Vanishes

Remain same

It mass of bob o a simple pendulum is doubled, its time period.

Choose an answer

is doubled

become four times

remains same

none of the above

When a Uranium (92 protons)ejects a beta particle, how many protons are left in the remaining nucleus?

Choose an answer

89 Protons

90 Protons

91 Protons

93 Protons

The resistance of conductors is due to:

Choose an answer

Protons

Fixed atoms

Molecules

Neutrons

Which one is a safety device?

Choose an answer

Switch

Fuse

Circuit breaker

Both B and C

Eight bits combine to form:

Choose an answer

A byte

Megabyte

Kilobyte

Gigabyte

the resistance of conductor is inversely to:

Choose an answer

temperature

length

area of cross section

pressure

The unit of spring constnat is:

Choose an answer

m

kg

Nm²

Nm^-1

A device which has two way communication is:

Choose an answer

Television

Radio

Hard disk

Mobile phone.

the water waves after striking the hurdle will:

Choose an answer

reflect

refract

diffract

all a b and c

Kg ms-1 can also be written as

Choose an answer

Nm

Ns

Ns-1

Js

When a body is moving along a circular path, then such a motion is called

Choose an answer

Vibratory motion

Rotatory motion

Linear motion

None of these

The property of bending of light around obstacles is

Choose an answer

Interference

Diffraction

Polarization

Superposition

If 30 waves per second pass through a medium at a speed 30 ms-1, then the wavelength is.

Choose an answer

30 m

15 m

1 m

28 m

The value of a time period of allow flying satellite is

Choose an answer

1 year

84 minutes

28 hours

1 day

Blood has density equal to that of

Choose an answer

Mercury

Sodium

Honey

Water

The rate of change of angular velocity is called

Choose an answer

Angular velocity

Angular acceleration

Angular displacement

Angular speed

Speed of sound in copper is

Choose an answer

38000 ms-1

3600 ms-1

3500 ms-1

3400 ms-1

the velocity of sound is maximum at 20 ^oC in

Choose an answer

Lead

Copper

Glass

Iron

The difference between two molar capacities is equal to.

Choose an answer

Plank's constant

General gas constant

Molar gas constant

Boltzmann constant

The internal energy of a piece of lead when beaten by hammer will.

Choose an answer

Increase

Decrease

Remains constant

Increases and then decrease

An ordinary glass gradually softness into a paste like state before it becomes a very viscous liquid which is possible at

Choose an answer

900^oC

600^oC

800^oC

100^oC

The sum of positive and negative peak value called.

Choose an answer

R.M.S. value

P-P value

Peak value

Average value

We can never accurately describes all aspects of sbatomic particles simulatanously. It is correct according to:

Choose an answer

Uncertainity Priciple

De-broglie Theory

Einstin Theory

Photo electric effect

The force which is responsible for the breaking up of the radioactive element is.

Choose an answer

Weak nuclear force

Strong nuclear force

Electromagnetic force

Gravitational force

The circuit of full wave rectification consist of

Choose an answer

Three diodes

Four diodes

Two diodes

One diode

Minimum energy needed to escape an electron ofrm metal surface is called:

Choose an answer

Threshold energy

Threshold frequency

Work function

Work ability

The e/m of a neutron is

Choose an answer

Less than electron

The same as electron

Zero

Greater than election

In an N-type silicon, which of the following statement is true?

Choose an answer

Electrons are majority carriers & trivalent atoms are the dopants

Electrons are majority carriers & pentavalent atoms are the dopants

Holes are minority carriers & pentavalent atoms are the dopants.

Holes are minority carriers & trivavalent atoms are the dopants.

If the potential difference across two plates of capacitor is doubled, then energy stored in it will be.

Choose an answer

Two times

Eight times

Four times

Remain same

if time constant in RC series circuit is small, then capacitor is charged or discharged.

Choose an answer

Slowly

Rapidly

At constant rate

Intermittently

The value of Rydberg constant is

Choose an answer

1.0974 x 10⁷ m^-1

1.0974 x 10^-7 m^-1

1.0974 x 10⁶ m^-1

1.0974 x 10^-6 m^-1