Question # 1

Evaporation takes place from liquid :

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Everywhere

Above surface only

Below surface only

Middle of liquid

Unit of pressure is :

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N/ m

Pa

N

m/N2

The temperature at which a solid start melting is:

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Freezing point

Melting point

Fusion point

Both B and C

The main source of energy in the unierse is:

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Moon

Stars

Sun

Planets

All bodies absorb or emit energy by

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convection

radiation

conduction

both (a) & (c)

Mass is measured by:

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Spring balance

Measuring cylinder

Physical Balance

None of these

The energy store in an atom or molecule due to intermolecular force is:

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Kinetic energy

Potential energy

Internal energy

G.P.E

Near the surface of Earth, the gravitational field strength is

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10 Nkg-1

Zero

100 Nkg-1

1000 Nkg-1

The transfer of heat by vibrating molecules in solids :

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Conduciton

Radiation

Convection

None

___________ varies with height.

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Weight

Pressure

Mass

Energy

When horse pulls a cart, the action is on the:

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Cart

Earth

Horse

Earth and cart

The lines will be in the form of concentric circles, if conductor is:

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Circular

Straight

Solenoid

None of these

diamond des not conduct electricity, because it has no:

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free electrons

free protons

free neutrons

free positive charge

For the emission of electrons from the tungsten filament the values of current and voltage are taken as:

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0.1 A and 2V

0.2 A and 4V

0.3A and 6V

0.4A and 8V

waves whose speed is equal to speed of light are:

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X-rays

sound rays

electromagnetic waves

shock waves

Which frequency is used by elephants to communicate with each other:

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Zero frequency

Low frequency

Medium frequency

High frequency

Spherical mirrors are used in:

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Medical

Search light

Microscope

All of these

Intensity level of the sound produced by mosquito buzzing is:

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70 dB

40 dB

10 dB

120 dB

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 half life of radium - 226 is 1620 years. If N is its total amount then after the four half lives, its left amount will be:

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1/2 N

1/4 N

1/8 N

1/16 N

As the temperature of a conductor rises, its resistance.

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Increase

Decrease

Does not change

None of these

The output of OR gate would be '0' When:

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Both of its inputs are zero

One of its two inputs is zero

Both of its inputs ar 1

Any one of its inputs is 1

Let A = Area of cross section of pipe, v = speed of fluid, then 'Av' is called.

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Volume flow rate

Energy flow rate

Mass flow rate

Pressure flow rate

Sound travel faster in

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CO2

H2

O2

He

Reapters are placed in new system at distance of.

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30 km

50 km

80 km

100 km

The direction of angular velocity is determined.

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Left hands rule

Head to tail rule

Right hand rule

General rule

Torricelli's theorem is given by

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A fog droplets are in freely falling condition,. the ratio of their radii is 2:3, the ratio of their terminal velocities will be.

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2:3

4:6

4:9

9:4

Half wavelength corresponds to

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0 ^o

90 ^o

180 ^o

360 ^o

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

The SI unit of angular displacement is.

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Degree

Revolution

Radian

Rotation

Almost all the raw energy is librated from

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Heat

Earth

Light

All of these

Frequency 'f' and time period 'T' are related as

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_______ is the building block of every electronic circuit.

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Semi conductor diode

Resistor

Capacitor

Amplifier

When the back emf in a current is zero, it draws

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Zero current

Maximum current

Minimum current

Steady average current

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

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Baryons

Leptons

Mesons

Quarks

Potassium Cathodes in photocell emit electrons for a light.

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Visible

Infra red

Ultra violet

X rays

Electric potencial of earth is taken to be zero because the earth is good:

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Semiconductor

Conductor

Insulator

Dielectric

Photo copier and inkjet printer are the applications of

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Magnetism

Electricity

`.Electro magnetism

Electrostatics

The electrons in one coulomb change is equal to.

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1.6 x 10^-19

2.25 x 10^-19

6.25 x 10^-18

6.25 x 10^-19

When some di electric is inserted between the plates of a capacitor, then capacitance.

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Decreases

Increases

Becomes zero

Becomes infinity

Presence of dielectric always.

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Increase the electrostatic force

Reduces the electrostatic force

Do not effect electrostatic force

Doubles the electrostatic force

The ability of a body to return to its original shape is called.

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Strain

Stress

Elasticity

Plasticity

Which is true for both alpha particle and gama rays.

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They cause ionization in air

They can be deflected by electric field

They can be deflected by magnetic field

The y can penetrate a few millimeters of aluminium