Question # 1

If Fx and Fy are rectangular components of vector F, then its direction is determined by the relation

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θ = sin-1 Fv/Fx

θ = tan-1 Fx/Fy

θ = tan Fx/Fy

θ = tan Fy/Fx

The altitude of geostationary orbits in which communication satellites are launched above the surface of the Earth.

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850 km

1000 km

6400 km

42,300 km

Heat reflected form the body depends upon :

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Colour and form

Form and speed

Color and speed

None

The value of g on moon's surface is 1.6 ms-2. What will be the weight of a 100 kg body on the surface of the moon?

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100 N

160 N

1000 N

1600 N

The insulator of heat is:

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Cork

Cotton

Wood

All

Boiling point of water is:

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0 ^oC

100^oC

212^oC

180^oC

Speed of the satellites of GPS around earth is:

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3.87 ms^-1

387 kms^-1

3.87 kms^-1

38.7 kms^-1

The parallel forces which have same direction are called.

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Resutant force

Like parallel force

Unlike force

Null force

Einstein's mass-energy equation is

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E = mc

E = mc2

E = 2mc

E = m2c

Base / Hypotenuse is called:

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Sin𝜽

Cos 𝜽

Tan 𝜽

Cot 𝜽

Which surface is bad emitter:

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White surface

Black surface

Coloured surface

Silver surface

The reason carbon dating work is that.

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Plants and animals are such strong emitters of carbon 14

After a plant or animal dies, it stops in fresh carbon

There is so much non radioactive carbon dioxide in the air

When a plant or animal dies.

Which waves of the following has highest frequency?

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Radio waves

Micro waves

Light wave

Sound wave

Isotopes are atoms of same element with different :

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Atomic mass

Atomic Number

Number of proton

Number of Neutron

The presence of a magnetic field can be detected by a

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small mass

Stationary positive charge

Stationary negative charge

Magnetic compass

1 volt is equal to:

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JC

JC^-1

JC^-2

JC^-3

The SI unit of electric field intensity is:

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NC-2

NC-1

Ns

Nm-1

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

If the mass of a spring mass system is doubled, its time period becomes:

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√2 T

T/2

√T/2

T/√2

In computer terminology information means.

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any data

raw data

processed data

large data

The temperature at the centre of sun is.

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10 million k

20 million k

30 million k

35 million k

Which device is used to increases / decreases A.C Voltage?

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Electric motor

Transformer

A.C Generator

Solenoid

The work done is isochoric process is.

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Constant

Variable

Zero

Depend upon condition

The distance between two consecutive crests of troughs is called

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Time period

Wave length

Frequency

Displacement

Work has dimension lime

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Torque

Momentum

Velocity

Power

One complete round trip of a body is called

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Displacement

Time period

Vibration

Frequency

The word Fluid means

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To rise

To fall

To flow

To oppose

The property of bending of light around obstacles is

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Interference

Diffraction

Polarization

Superposition

The frictional force is

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Conservative force

Non conservative force

Electric force

Magnetic force

Sound travel faster in

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CO2

H2

O2

He

The magnifying power is also called

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Resolving power

Angular magnification

Strength of eye

None of these

The fluid is said to be incompressible, if its density is.

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Zero

Very high

Constant

Very small

The rate of change of momentum is equal to

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Impulse

Torque

Velocity

Force

Automatic function of street light can be done by the use of.

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Inductor

Rectifier

Comparator

emf

A charge Q is divided into tweo parts q and Q-q and seperated by a distance R. The force of equilibrium between them will be maximum when:

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q=Q/4

q=Q/2

q=Q

None of these

The radius of hydrogen atom is:

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0.53A°

0.053A°

0.53 x 10^-9

0.053 x10^-9

Disintegration of photon on striking a nucleus into an electron and positron is known as.

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Annihilation of matter

Compton effect

Pair production

Photo electric effect

Soft magnetic material is

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Sodium

Steel

Iron

Copper

Thermistor with high - ve temperature coefficient are very accurate for measuring low temperature especially near is.

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10 kelvin

70 kelvin

200 kelvin

35 kelvin

Young's modulus for water's is

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Zero

1

2

3

Eddy current is one cause energy loss in

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A.C. generator

Transformer

D.C. motor

D.C. generator

The unit of radioactivity is:

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Bequerel

Henry

Pascal

Joule

The energy equivalent of 1 kg of matter is about:

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10^-15 J

1 J

10^-12J

10^-17J

The thermistors convert changes of temperature into.

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Light energy

Electric voltage

Heat

Sound