Question # 1

Centre of gravity of sphere is at:

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Centre of sphere

Outside of sphere

Radius of sphere

None of these

The weight of a body of mass 20 kg is:

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2 N

10 N

20 N

200 N

1 mega watt is equal to:

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10² W

10³ W

10⁵ W

10⁶W

hp stands for :

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1w

Horse power

Joule

All are true

Two equal but unlike parallel forces having different line of action produce:

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A torque

A couple

Equilibrium

Neutral equilibrium

Hydro meter is used to measure:

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Pressure

Density

Area

Volume

The energy released int he form of nuclear radiations in addition to heat and light is called:

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Mechanical energy

Gravitational energy

Chemical energy

Nuclear energy

Water boils at:

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0°F

0°C

100°C

100 K

Coefficient of friction between tyre and dry road is.

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0.6

1

0.05

0.2

Water freezes at

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0oF

32oF

273 K

0 K

Kinetic and potential energy are the kinds of energy:

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Chemical

Nuclear

Light

Mechanical

Which type of capacitor is cylindrical in shape:

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Paper capacitor

Mica capacitor

Variable capacitor

Plates capacitor

An electric current in conductors is due to the flow of:

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Positive ions

Negtive ions

Positive charge

free electron

In totally reflecting prism one angle is of 90^o, and other two angles are of:

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30^o,30^o

45^o,90^o

45^o,45^o

40^o,40^o

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

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Longitudinal waves

Transverse waves

Electromagnetic waves

Both a and c

If we double both the current and the voltage in a circuit while keeping its resistance constant, the power:

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Remains unchanged

Halves

Doubles

Four time

Power of electric heater is:

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1500W

4750W

100W

50W

If there is no extension in the spring then the position is called:

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Equilibrium position

unequilibrium

neutral equilibrium

stable equilibrium

In CD presence of pits is indicated by:

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0

2

3

1

Time period is reciprocal of:

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Frequency

Cycle

Wave-length

Amplitude

Why household appliances should be connected in parallel with the voltage source:

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To increase the resistance of the circuit

To decrease the resistance of the circuit

To provide each appliance the same voltage as the power source

To provide each appliance the same current as the power source

Eight bits combine to form:

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A byte

Megabyte

Kilobyte

Gigabyte

A stretched string 2 m long and it has 2 hopes of stationary waves hen the wavelength is

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4 m

2 m

3 m

1 m

Artificial gravity can be created in the space ship by

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Revolving around the earth

Spinning around its own axis

Increasing its velocity

Decreasing it svelocity

When the amplitude of a wave become double, its energy becomes

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One half

Two times

Three times

Four times

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

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Vibratory motion

Rotatory motion

Linear motion

None of these

X-ray diffraction has been very useful in determining the structure of

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Hemoglobin

Stars

Galaxies

Stones

Diffraction is a special type of

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Reflection

Polarization

Interference

Refraction

If heat engine absorb 400 J and rejects 200 J heat energy, its efficiency will be.

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25%

50%

70%

100%

Average translational K.E. of molecules for an ideal gas is given as

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1/2 KT

KT

2/3 KT

3/2 KT

The Bragg's equation is given by

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The work done will be maximum when angle between F and d.

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180^o

0^o

90^o

60^o

Time rate of change of angular displacement is called

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Linear velocity

Angular velocity

Rotational velocity

Vibrational velocity

The drift velocity is of order:

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10^-13m/s

10³ m/s

10^-3m/s

10^-4m/s

The ratio of applies stress to volumetric strain is called:

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Young modulus

Shear modulus

Bulk modulus

Tensile modulus

Electromagnetic induction is exactly according to law of:

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Momentum

Charge

Energy

Mass

Semiconductors have conductivity of order:

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10^-8 to 10^-6 (Ωm)^-1

10^-6 to 10^-4 (Ωm)^-1

10² to 10⁵ (Ωm)^-1

10^-5 to 10^-7 (Ωm)^-1

If we make magnetic field stronger the value of induced current is.

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Decreased

Increased

Vanishes

Remain constant

Power dissipated in a pure inductor is.

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Large

Small

Infinite

Zero

The value of e/m is smallest for

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Proton

Electron

Beta particle

Positron

Logic gate can control some physical parameters like.

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Temperature, Pressure

Resistance, Inductance

Capacitance, Impedance

Current, voltage

When charge particle enter perpendicular to magnetic field, the path followed by it is:

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A helix

A circle

Straight line

Ellipes

Which device is used as a rectifier?

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Capacitor

Transistor

Diode

Transformer

The device in which induced emf is statically induced emf is:

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Transforms

AC generator

Alevator

Dynamo