Question # 1

Feathers of bird give good thermal:

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Conduction

Insulation

Convection

None of these

Pressure is quantity.

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Vector

Scalar

Base

Derived

The gravitational field exist _________ the earth.

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One direction

Upward

All aorund

Downward

The range of clinical thermometer is:

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90 ^oC - 106^oC

35^oC - 42^oC

100^oC - 132^oC

24^oC - 35^oC

If an object is moving with a uniform changing speed then speed time graph .

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Variable

Parallel to time axis

Straight line

Clockwise torque is taken:

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Positive

Negative

Neutral

Nil

Einstein's mass-energy equation relation is:

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E =1/2 mc²

E =mc²

E =m²c

E = 2 mc²

__________ forces have opposite direction:

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Unlike parallel

Parallel

Like parallel

None of these

in isolated system the momentum after collision of two bodies.

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Increase

Constnat

Decrease

Zero

If a body does work at the rate of 1 Js^-1then its power will be:

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KW

1 MW

1 W

None of these

The formula to determine the centripetal force is:

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Ms

mv²/r

Ns

Ns^-1

Which element is used to locate the ulcer in brain?

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Iodine-131

Phosphorus-32

Carbon-14

Potassium-40

The frequency of silent whistle is:

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20,000 Hz - 25000 Hz

2000 Hz - 25000 Hz

200 Hz - 2000 Hz

25000 Hz

The two inputs of a NAND gate are A and B. Its output would be zero when:

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A = 0, B = 0

A = 1, B= 0

A = 1 , B = 1

A = 0 , B = 1

Specific resistance of copper is ____________ x 10^-8Ohm-meter

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1.62

1.69

5.25

2.75

The waves in which particles of the medium vibrate perpendicular to the direction of waves are:

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Electromagnetic waves

Sound waves

Both a and b

Transverse waves

Which we double the voltage in a simple electric circuit. We double the

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Current

Power

Resistance

both a and b

The ratio of image height to object height is called:

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Linear magnification

Power

Refraction

Radius of curative

High pitch means:

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High wavelength

High frequency

High time period

High energy

Which is not a hardware:

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CPU

Window

Keyboard

Mouse

What is the voltage across a 6 Ω resistor when 3 A of current passes through it:

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2 V

9V

18 V

36 V

The unit of spring constant is:

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m

kg

Nm²

Nm^-1

A direction of torque is

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Along the position vector r

Perpendicular to both r and f

Along the direction of force F

Opposite to the direction of r

A set of frequencies which are multiples of the fundamental frequency are called.

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Doppler effect

Nodal frequencies

Beat frequencies

Hamonics

The periodic variations of sound between maximum and minimum loudness are called.

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Doppler's effect

reflection

Laplace correction

Beats

Two waves of same frequency and moving in the same direction produces.

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Interference

Diffraction

Beats

Stationary waves

First law of thermodynamics can be defined by the equation

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The magnification of a convex lens of focal length 5 cm is equal to.

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5

6

10

23

Bending of light around the edges of an obstacle is called.

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Refraction

Polarization

Interference

Diffraction

When a body moves in circular motion, the angle between linear and angular velocity is.

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180^o

90^o

60^o

75.3^o

The relation between the speed and hoop can be written as

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2

4

1/2

1/4

In reversible process the entropy of system.

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Remain constant

Decrease

Increase

Becomes zero

Which is unimportant in describing the satellites orbit.

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Distance of satellite from earth's center

Gravitational constant G

Mass of satellite

Mass of earth

Which diode works at reverse biasing.

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LED

Photo voltaic cell

Photo diode

Silicon diode

A positron is a particle having.

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Mass equal to electron

Charge equal to electron

Mass equal to mass of electron but charge opposite to charge of electron.

Mass equal to proton

The amount of energy equivalent to 1 a.m.u is

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931.5 MeV

93.15 MeV

9.315 MeV

2.224 MeV

The motional emf depends upon the

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Length of conductor

Speed of conductor

Strength of magnet

All of these

Boher proposed his atomic model in:

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1910

1911

1912

1913

Lorentz force means the force acting on a particle, which is

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Magnetic force only

Electric force only

Sum of electric and magnetic force

None of these

A current generator device converts:

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Mechanical energy into chemical energy

Chemical energy into electrical energy

Mechanical energy into electrical energy

Both b and c

Induced emf in A.C. generator can be increased by

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Decreasing area of coil

Decreasing magnetic field

Increasing area of coil

Slowing down speed of coil

Frequency of x-rays depends upon.

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Number of electrons striking target

Accelerating potencial

Nature of the target

Both B and C

Special organs called ampullae of lorenzenite are present in.

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Bats

Cats

Dogs

Sharks

The mass of protons is:

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1.675 x 10^-27 kg

1.693 x 10^-27 kg

1.673 x 10^-31 kg

1.673 x 10^-27 kg