Question # 1

The unit of Heat is:

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Kelvin

Joule

Jkg^-1 K^-1

kg

If a liquid of mass 'm' requires thermal energy 'ΔQv' to completely change into gas at its boiling point without any change in its temperature, then its latent heat of vapourization can be calculated as following:

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Hv = m/ΔQv

Hv = mΔQv

Hv = cmΔQv

Hv =ΔQv/m

On Uranus the daytime temperature is ___________

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216 °C

-216 °C

-200 °C

-100 °C

The kinetic energy of a body of mass 2 kg is 25J, its speed is

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5 ms-1

12.5 ms-1

25 ms-1

50 ms-1

The SI unite of density is

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gcm-3

gm-3

gdm-3

kgm-3

Sin 45^ois

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0.707

0.5

1

0.2

The unit of electric charge is

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Ampare

Joule

Coulomb

Volt

Fossils fuels are usually compound of:

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Carbon

Hydrogen

Carbon & Hydrogen

None of these

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 temperature of a black dull surface on heating :

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Rise Rapidly

Fall Rapidly

Becomes zero

Remain constant

Feathers of bird give good thermal:

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Conduction

Insulation

Convection

None of these

The critical angle for glass to:

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24^o

48^o

42^o

50^o

Time period is reciprocal of:

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Frequency

Cycle

Wave-length

Amplitude

Electron gun has an electrode called for controlling the flow of electrons in the beam:

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Plate

Grid

Screen

Filament

If the displacement in spring is ‘x’ of mass “m” attached with a spring then restoring force is:

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F=ma

F=kx

F=-kx

F= m/a

At extreme position potential energy of the pendulum is

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Maximum

Miimum

a and b

zero

When a ray of light enters from denser medium to rare medium, the angle of incidence for which angle of refraction is 90° is called:

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Angle of incidence

Critical angle

Angle of refraction

Angle of deviation

F=

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qE

q-E

q/E

q+E

In medical field, C.R.O is used to display:

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Heart beats

Pictures of organs

Pictures of bones

Blood pressure

The A.C. used in our houses has frequency _____ cycle/sec

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60

30

50

130

The relation between v,f andλ of a wave is:

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vf=λ

fλ = v

vλ =f

v=λ/f

Number of poles in a magnet is:

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One

Two

Three

Unlimited

Work has dimension lime

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Torque

Momentum

Velocity

Power

Dark fringes are also called as

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Minima

Maxima

Wave front

Ray of light

A heat engine operates between the temperature 1000 K and 400 K, Its efficiency is.

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100%

70%

60%

50%

The mean kinetic energy of gas is at.

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0 ^oC

-273 ^oC

100 K

100 ^oC

1 torr in Nm-2 is expressed as.

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130.5 Nm-2

133.3 N m-2

140.2 Nm-2

135.2 Nm-2

The unsteady flow of a fluid is called

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Stream line

Turbulent flow

Average flow

Viscous flow

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

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Doppler's effect

reflection

Laplace correction

Beats

The tides raise in the sea roughly

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Once a day

Twice a day

Three a day

Four time a day

A man of mass 5 kg is falling freely, the fore acting on it will be

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5 N

9.8 N

19.6 N

49 N

The area between velocity time graph and the time axis is numerically equal to.

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?Speed of object

Distance covered by the object

Average velocity of the object

Acceleration of the object.

The artificial satellites are held in orbits by

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Gravitational force

Electric force

Magnetic force

All of these

If a charge body moved against the electric field it will again

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Potential energy

K.E

Mechanical Energy

Electric potential energy

Which is the most refined form of matter.

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Smoke

Fog

Light

Electron

Write the SI unit of magnetic flux.

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Tesla

Weber

Weber m-2

Tesla m2

In Series resonance circuit the impedance of circuit art resonance frequency, is

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Maximum

Minimum

It is unequal to R

None of above

The most useful tracer is.

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Strontium -90

Iodine -31

Cobalt -60

Carbon -14

Ampere's law is applicable to:

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Circular path

Rectangular path

To any closed path

Nonwe of these

Resistivity at a given temperature depends upon.

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Area of cross section

Length

Nature of material of conductor

Both length and area

The current through a resistance of 100 Ohm when connecting across a source of 220 V is.

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22000 A

22 A

2.2 A

0.45 A

Heat energy is converted into electrical energy.

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Solar cells

thermocouples

Electric generators

None of above

The unit of temperature co efficient of resistivity is.

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Ohm -m

K-1

K

Ohm

The mass of an object will be doubled at speed.

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2.6 x 10⁸ m/s

1.6 x 10⁸m/s

2.6 x 10⁷m/s

3.6 x 10⁷ m/s