Question # 1

Rocket works on principle of ______________

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Action Reaction

Law of inertia

Mass energy

Nil

The centre of gravity of uniform triangle is:

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Point of intersection of medians

On its vertex

On middle point of its axis

Point of intersection of diagonal

Transfer of heat by actual movement of molecules form hot place to cold place is called:

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Conduction

Convection

Radiation

None

If the applied force is 'F' and its moment arm is 'r' then torque is defined as

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τ = rF

τ = r2F

τ = r + F

τ = 2rF

The S.I unit of power is:

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Newton

Watt

Joule

Coulomb

Unit of strain is

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Nm

N

Both a and b

No unit

the value of gravitational field strength near the earth is ________ Nkg^-1.

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1.62

100

10

160

A ball of mass 1 kg moving with velocity 2 ms-1, Its momentum will be

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1 Ns

2 Ns

0.5 Ns

4 Ns

If mass of body is 10 kg travelling with speed of light, how much energy is generated?

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E = 9 × 1017 J

E = 9 × 1015 J

E = 9 × 1018 J

E = 9 × 1016 J

A body possesses if it is capable to do work:

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Energy

Power

Force

All

Which of the following is a vector quantity?

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Distance

Power

Speed

Displacement

The distance between two consecutive waves compressions or rarefactions is called:

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Focal length

Wave length

Frequency

Time period

Information storage device work on the principles of:

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Heat

Sound

Light

Magnetism

Which device is used to show the change in the value of current or electrical potential as a graph?

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Cathode ray tube

Electron gun

Oscilloscope

Transformer

The process by which electrons are emitted by a hot metal surface is

known as:

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Boiling

Evaportion

Conduction

Thermionic emission

Critical angle for diamond is:

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60^o

24^o

26^o

49^o

The parts of computer which can be seen and touched are called:

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Hardware

Software

Modem

CPU

Those quantities whose values do not remain constant are called:

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physical quantities

Digital quantites

Log quantities

Analog quantities

Which type of capacitor is cylindrical in shape:

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Paper capacitor

Mica capacitor

Variable capacitor

Plates capacitor

Which is an example of a longitudinal wave:

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Sound wave

Light wave

Radio wave

Water wave

A digital multimeter is used to measure:

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Current

Resistance

Potential difference

All of above

Each volt of lightening contains energy:

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4x10⁶ joules

1000 joules

1000 million joules

10 joules

The K.E. of bullet of mass 500 gm moving at a speed of 200 ms-1

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250 J

125 J

2500 J

10,000 J

The location of near point changes with

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Age

Size of the eye

Sharpness of the eye

None of these

The drag force increases as the speed of object

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Become zero

Decreases

Increases

Remains constant

If the slope of the velocity time graph remain constant then body is moving with.

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Uniform velocity

Negative variable acceleration

Variable acceleration

Uniform acceleration

Force acting on the piston to move outward is.

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Compressive stoke

Power stoke

All stoke

Exhaust stoke

The efficiency of heat engine whose sink is at 17 ^oC and source at 200 ^oC is.

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38%

63%

80%

90%

The temperature scale which is independent of nature of substance is.

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Thermodynamic scale

Centigrade scale

Fahrenheit scale

Regnault scale

The value of of 'g' at the centre of the earth is

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Infinite

2 g

3 g

zero

The least distance of distinct vision for the normal eye is.

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15 cm

25 cm

125 cm

25 m

The fringe spacing increases if we use.

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Yellow light

Green lgiht

Blue light

Red light

The law of conservation of energy gives us

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Equation of continuity

Stock's law

Bernoulli's equation

Viscosity

A simple device that prevents the direction of current from changing is called.

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Commutator

Rotor

Armature

Detector

Unit (S.I) of temperature coefficient of resistivity of a material is

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K

K^-1

^oC

K^-2

A material which is insulator at 0 K and conduct at room temperature is.

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Silver

Lead

Germanium

Polythene

When meta I is heated sufficiently electrons are given off by the metal. This phenomenon is known as.

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Photoelectric effect

Piezo electric effect

Thermionic emission

Secondary emission

When platinum is it becomes orange at.

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500^oC

900^oC

1100^oC

1300^oC

A positron is an anti particle of.

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Proton

Electron

Neutron

Photon

The output from a full wave rectifier is

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An ac voltage

A dc voltage

Zero

A pulsating unidirectional voltage

Magnetic induction can be measured in units of.

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Tesla

Gauss

Weber/m2

All of the above

Charge on an electron was determined by

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Ampere

Millikan

Maxwell

Bohr

Materials can be identified by measuring their

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Mass

Half life

Both a and b

None of a,b,c

The movement of conductor in magnetic field produces electrical current was discovered in:

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1931

1731

1842

1831