Question # 1

Coloured surface is a

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Best emitter

Good emitter

Bad emitter

Wrost emitter

Cos 0^ois

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0

2

1

0.5

A body OF mass 10 kg taken to height of 5m:

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P.E = 500 J

P.E = 50 J

P.E = 5 J

P.E = 5000 J

____________ deals with temperature .

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Bio physics

Geophysics

Thermo physics

Plasma physics

The temperature of a black dull surface on heating :

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Rise Rapidly

Fall Rapidly

Becomes zero

Remain constant

Thermal conductivities of Lead

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23

30

35

85

Work is done when force displace inits own _____________

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Way

Method

Direction

None

At sea level height if mercury is:

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1000 cm

10 cm

1m

76 cm

Convection of heat is a process of heat transfer due to;

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Random motion of molecules

Downward motion of molecules

Upward motion of molecules

Free motion of molecules

The unit of momentum is:

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kgms^-2

kgms^-1

Ns^-1

None of these

At the surface of the earth value of 'g' is measured by using formula:

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g=GMe/R

g = GMe/R²

g = 2GMe/R²

g = GMe/2 R

According to ohm’s law V= :

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I²R

IR²

IR

I/R

What should household appliances 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

The speed of sound in air at 21 °C is:

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336ms^-1

343ms^-1

430ms^-1

470ms^-1

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

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Increased

Much less

Decrease

No change

Which of the following reasons increase the importance of computer:

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Speedy

Long time storage of memory

Quick decision

All of these

When frequency of sound wave is increased, which of the following decreases?

i) Wavelength ii) Period iii) Amplitude

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i only

(iii) only

i and ii only

i and iii only

The unit of resistance is:

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Ω-m

Ω

V

C

Resistance of conductor is directly proportional to:

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Length

Pressure

Area

All of these

If Current flowing through switch then the output is expressed as:

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0

1

-1

2

The half life of Lead Pb is

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10 hour

10.10 hours

10.6 hours

1 year

The quantities, whose values remain constant or vary continuously are called.

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Analogue quantities

Digital quantities

Maximum quantities

Minimum quantities.

If 30 waves per second pass through a medium at a speed 30 ms-1, then the wavelength is.

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30 m

15 m

1 m

28 m

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

Bright fringes are also called as

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Minima

Maxima

Wave front

Ray of light

Which of the following is not directed along the fixed axis of rotation.

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Angular displacement

Angular momentum

Centripetal acceleration

Angular acceleration

One complete round trip of a body is called

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Displacement

Time period

Vibration

Frequency

Young in 1801 performed experiment for the first time about

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Interference

Diffraction

Polarization

Particle nature of light

International Telecommunication satellite

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4,6,8 and 10 Hz

4,6,11 and 14 GHz

4,6,8 and 12 Hz

4,8,11 and 16 GHz

The SI units of solid angle is

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Streadian

Radian

Degree

None of these

The product of cross sectional area of a pipe and speed of fluid along the pipe is

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Zero

Maximum

Constant

Variable

Efficiency of steam locomotive is.

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8%

10%

9%

7%

The units of magnifying power of microscope or telescope are.

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Metre

m^-1

dioptre

No unit

Which of the following series of hydrogen spectrum lies in ultra violet region.

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Lyman sereis

Paschen series

Balmar series

Bracket series

Mutual induction has a practical role in the performance of the.

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Radio choke

Transformers

A.C. Generator

D.C. Generator

In current carrying long solenoid the magnetic field produced does not depend upon.

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The radius of solenoid

Number of turns per unit length

Current flowing through solenoid

All of the above

The product of resistance and conductance is

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1

Resistivity

Conductance

Zero

High frequency radio wave is called as

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Fluctuate

Carrier wave

Matter wave

Mechanical wave

The unit of radioactivity is:

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Bequerel

Henry

Pascal

Joule

In an nihilation emitted photons moves in opposite directions to conserve.

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Mass

Charge

Energy

Momentum

If the distance between two charges is halved and charges are also doubled, then force between them will be.

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Two time

Four time

Eight time

Sixteen time

In the Bohr's model of the hydrogen atom, the lowest orbit corresponds to:

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Infinite energy

Maximum energy

Minimum energy

Zero energy

In extrinsic semiconductors doping is of the order of.

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1 atom to 10⁴

1 atom to 10⁶

1 atom to 10⁸

1 atom to 10³

The gain of transistor amplifier depends upon

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Resistance connected with collector

Resistance connected with base voltage

Input voltage

Output voltage