Question # 1

Alcohol has specific heat in Jkg^-1 K^-1 is:

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2500

4200

1000

138.6

Kilowatt - hour is unit of _____________

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Power

Energy

Work

K.e

SI unit of pressure is pascal, which is equal to

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104 Nm-2

1 Nm-2

102 Nm-2

103 Nm-2

Heat can be transmitted form one object to the other by

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convection

radiation

conduction

all of these

Co-efficient of friction between wood and concrete.

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0.63

0.8

1

0.9

The number 275.00 consists of significant figures.

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4

3

2

5

Absolute zero is equal to

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0 K

273

-273 K

373 K

The specific heat of glass is:

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501.72

500

501

502

In large building central heating system worms on the principle of

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conduction

convection

radiation

waves

Earth's gravitational force of attraction vanishes at

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6400 km

Infinity

42300 km

1000 km

In Einstein's mass-energy equation ,c is the

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Speed of sound

Speed of light

Speed of electron

Speed of Earth

A parallel circuit is also used as a divider for:

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Power

Resistance

Current

Voltage

What will be the capacitance of capacitor by joining them in parallel:

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Increased

Much less

Decrease

No change

The resistance of voltmeter is:

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zero

low

Very high

10Ω

Resistance of a wire of conductor of 2 Ω resistance is doubled:

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4 Ω

6 Ω

8 Ω

10 Ω

The unit of intensity of sound:

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Wm^-1

Wm^-2

Wm

Wm²

In 1950, physicists observed that in cathode ray tube a special type of rays produced from cathode, these rays were called:

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Cathode rays

X-rays

Alpha rays

Gamma rays

The temperature at the centre of sun is.

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10 million k

20 million k

30 million k

35 million k

The SI the unit of charge is:

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Jpi;e

Volt

Coulomb

Watt

NOT gate is also called:

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Converter

Inverter

Transmitter

Receiver

One micro coulomb charge is equal to:

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10^-3c

10³c

10⁶c

10^-6c

Wave equation is defined as:

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f = Tλ

f = V λ

V = 2fλ

V = fλ

the wavelength of transverse wave travelling with a speed 'v' having frequency 'f' in equal to

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f/v

Vf

V/f

f/V2

The law of conservation of mass gives.

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Beronoulli's

Venturi relation

Torricelli's theorem

Equation of continuity

The resultant of two forces 3 N and 4 N acting at right angle to each other is

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7 N

5 N

4 N

1 N

A Carnot engine has an efficiency of 50% when its sink temperature is at 27 ^oC. The temperature of source.

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273^oC

300 ^oC

327 ^oC

373 ^oC

The resultant of two vectors having magnitude 12 N and 8 N can not be

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2 N

20 N

10 N

16 N

The distance between two consecutive crests of troughs is called

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Time period

Wave length

Frequency

Displacement

The direction of null vector can be

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(+) ve

(-) ve

Arbitrary

Zero

Mercury is used as a thermometric substance because

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It is opaque

Does not stick to glass

Has low specific heat

All of these

When two identical waves superimposed, which can change.

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Wave length

Frequency

Velocity

Amplitude

The focal length of a concave lens is always

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+ve

-ve

Zero

None of these

Standard metal according to Michelson's interferometer is equivalent to

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1553163.5 wave meter

3 x 108meter

15503000 meter

None of these

The photon with energy greater than 1.02 MeV can interact with matter as.

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Photoelectric effect

Compton effect

Pair production

annihilation of matter

A particles equal or greater in mass than of protons are called.

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Baryons

Leptons

Mesons

Quarks

The scientist who suggested the presence of neutron was:

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Bohr

Rutherford

Chadwick

J.J Thomson

Transformer is used to change

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Electric power

Magnetic field

Alternating voltage

Phase of A.C.

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

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1931

1731

1842

1831

The output from a full wave rectifier is

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An ac voltage

A dc voltage

Zero

A pulsating unidirectional voltage

μ_∘(Ampere's constant) has value.

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4πx10^-7 WbA^-1m^-1

4πx10^-17 Wbm²

4πx10⁷ WbA^-1m^-1

4πx10-27 Wb/m²

The natural frequency of L.C circuit is equal to

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The sensor of light is.

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Transistor

LED

Diode

Light dependent resistance

Which one of the following is not affected by electric or magnetic field.

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Beta rays

Gama ryas

Alpha rays

Electron

The unit of Plank's constant 'h' is.

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JC

J/C

JS

J/S