Online GK Test

GK Test
 

Question: Rainbow is due to

1

absorption of sunlight in minute water droplets

2

diffusion of sunlight through water droplets

3

ionisation of water deposits

4

refraction and reflection of sunlight by water droplets

View Answer

Correct Answer: 4

Question: ML2T-2 is the dimensional formula for

1

moment of inertia

2

pressure

3

elasticity

4

couple acting on a body

View Answer

Correct Answer: 4

Question: One nanometer is equal to

1

10-6m

2

10-8m

3

10-9m

4

10-5m

View Answer

Correct Answer: 3

Question: Mica is used in electrical appliances such as electric iron because mica is

1

a good conductor of heat but a bad conductor of electricity

2

a bad conductor of heat but a good conductor of electricity

3

a good conductor of heat as well as electricity

4

a bad conductor of heat as well as electricity

View Answer

Correct Answer: 1

Question: It is easier to roll a barrel full of coal tar than to pull it because

1

the full weight of the barrel comes into play when it is pulled

2

the rolling friction is much less than the sliding friction

3

more surface area of the barrel is in contact with the road when it is pulled

4

coal tar is a liquid and it flows in the barrel when it is rolled

View Answer

Correct Answer: 2

Question: Minimum number of unequal vectors which can give zero resultant are

1

two

2

three

3

four

4

more than four

View Answer

Correct Answer: 2

Question: Intensity of sound has

1

an object existence

2

a subject existence

3

no existence

4

both subjective and objective existence

View Answer

Correct Answer: 1

Question: Rain is falling vertically downwards. To a man running east-wards, the rain will appear to be coming

1

east

2

west

3

northeast

4

southeast

View Answer

Correct Answer: 1

Question: An aeroplane is flying horizontally with a velocity of 600 km/h and at a height of 1960 m. When it

1

1200 m

2

0.33 km

3

3.33 km

4

33 km

View Answer

Correct Answer: 3

Question: Radiocarbon is produced in the atmosphere as a result of

1

collision between fast neutrons and nitrogen nuclei present in the atmosphere

2

action of ultraviolet light from the sun on atmospheric oxygen

3

action of solar radiations particularly cosmic rays on carbon dioxide present in the atmosphere

4

lightning discharge in atmosphere

View Answer

Correct Answer: 1

Question: It is easier to roll a stone up a sloping road than to lift it vertical upwards because

1

work done in rolling is more than in lifting

2

work done in lifting the stone is equal to rolling it

3

work done in both is same but the rate of doing work is less in rolling

4

work done in rolling a stone is less than in lifting it

View Answer

Correct Answer: 4

Question: The absorption of ink by blotting paper involves

1

viscosity of ink

2

capillary action phenomenon

3

diffusion of ink through the blotting

4

siphon action

View Answer

Correct Answer: 2

Question: Nuclear sizes are expressed in a unit named

1

Fermi

2

angstrom

3

newton

4

tesla

View Answer

Correct Answer: 1

Question: out of the following, which is not emitted by radioactive substance?

1

Electrons

2

Electromagnetic radiations

3

Alpha particles

4

Neutrons

View Answer

Correct Answer: 4

Question: It is more difficult to walk on a sandy road than on a concrete road because

1

sand is soft and concreter is hard

2

the friction between sand and feet is less than that between concrete and feet

3

the friction between sand and feet is more than that between concrete and feet

4

the sand is grainy but concrete is smooth

View Answer

Correct Answer: 2

Question: Find the maximum velocity for the overturn of a car moving on a circular track of radius 100 m. Th

1

0.14 m/s

2

140 m/s

3

1.4 km/s

4

14 m/s

View Answer

Correct Answer: 4

Question: Large transformers, when used for some time, become very hot and are cooled by circulating oil.

1

the heating effect of current alone

2

hysteresis loss alone

3

both the heating effect of current and hysteresis loss

4

intense sunlight at noon

View Answer

Correct Answer: 3

Question: Rectifiers are used to convert

1

Direct current to Alternating current

2

Alternating current to Direct current

3

high voltage to low voltage

4

low voltage to high voltage

View Answer

Correct Answer: 2

Question: Let a thin capillary tube be replaced with another tube of insufficient length then, we find wa

1

will overflow

2

will not rise

3

depressed

4

change its meniscus

View Answer

Correct Answer: 2

Question: Sound waves in air are

1

transverse

2

longitudinal

3

electromagnetic

4

polarised

View Answer

Correct Answer: 2

Question: Magnetism at the centre of a bar magnet is

1

minimum

2

maximum

3

zero

4

minimum or maximum

View Answer

Correct Answer: 3

Question: Of the following properties of a wave, the one that is independent of the other is its

1

amplitude

2

velocity

3

wavelength

4

frequency

View Answer

Correct Answer: 1

Question: On a rainy day, small oil films on water show brilliant colours. This is due to

1

dispersion

2

interference

3

diffraction

4

polarization

View Answer

Correct Answer: 2

Question: Point A is at a lower electrical potential than point B. An electron between them on the line joinin

1

move towards A

2

move towards B

3

move at right angles to the line joining A and B

4

remain at rest

View Answer

Correct Answer: 2

Question: Inside an aeroplane, flying at a high altitude

1

the pressure is the same as that outside

2

normal atmospheric pressure is maintained by the use of air pumps

3

the pressure inside is less than the pressure outside

4

normal humidity and partial vacuum are maintained

View Answer

Correct Answer: 2

Question: Sound travels with a different speed in media. In what order does the velocity of sound increase in

1

Water, iron and air

2

Iron, air and water

3

Air, water and iron

4

Iron, water and air

View Answer

Correct Answer: 3

Question: One thousand microns is equal to

1

10-3m

2

10-6m

3

10-9m

4

10-12m

View Answer

Correct Answer: 1

Question: Sound travels at the fastest speed in

1

steel

2

water

3

air

4

vacuum

View Answer

Correct Answer: 1

Question: oil raise up the wick in a lamp. The principle involves

1

the diffusion of oil through the wick

2

the liquid state of oil

3

capillary action phenomenon

4

volatility of oil

View Answer

Correct Answer: 3

Question: Superconductors are substances which

1

conduct electricity at low temperature

2

offer high resistance to the flow of current

3

offer no resistance to the flow of electricity

4

conduct electricity at high temperatures

View Answer

Correct Answer: 3

Question: If two bodies of different masses, initially at rest, are acted upon by the same force for the sam

1

velocity

2

momentum

3

acceleration

4

kinetic energy

View Answer

Correct Answer: 2

Question: Pick out the scalar quantity

1

force

2

pressure

3

velocity

4

acceleration

View Answer

Correct Answer: 2

Question: Radio telescopes are better than optical telescopes because

1

they can detect faint galaxies which no optical telescope can

2

they can work even in cloudy conditions

3

they can work during the day and night

4

All of the above

View Answer

Correct Answer: 4

Question: Light Emitting Diodes (LED) is used in fancy electronic devices such as toys emit

1

X-rays

2

ultraviolet light

3

visible light

4

radio waves

View Answer

Correct Answer: 3

Question: Out of the following pairs, which one does not have identical dimension?

1

Moment of inertia and moment of a force

2

Work and Torque

3

Angular momentum and Planck's constant

4

Impulse and Momentum

View Answer

Correct Answer: 1

Question: Mercury is commonly used as a thermometric fluid rather than water because

1

specific heat of mercury is less than water

2

specific heat of mercury is more than water

3

mercury has greater visibility than water

4

density of mercury is more than the water

View Answer

Correct Answer: 3

Question: Optical fibre works on the

1

principle of refraction

2

total internal reflection

3

scattering

4

interference

View Answer

Correct Answer: 2

Question: Light from the star, Alpha Centauri, which is nearest to the earth after the sun, reaches the earth

1

4.2 seconds

2

42 seconds

3

4.2 years

4

42 years

View Answer

Correct Answer: 3

Question: Mach number is used in connection with the speed of

1

sound

2

aircraft

3

spacecraft

4

ships

View Answer

Correct Answer: 2

Question: On a stationary sail boat, air is blown from a fan attached to the boat. The boat

1

moves in opposite direction in which the air is blown

2

does not move

3

moves in the same direction in which air blows

4

spins around

View Answer

Correct Answer: 2

Question: Identify the vector quantity from the following

1

Heat

2

Angular momentum

3

Time

4

Work

View Answer

Correct Answer: 2

Question: Large astronomical telescopes always use as objective

1

lens

2

mirror

3

combinations of lenses

4

None of the above

View Answer

Correct Answer: 3

Question: One should not connect a number of electrical appliances to the same power socket because

1

this can damage the appliances due to overloading

2

this can damage the domestic wiring due to overloading

3

this can damage the electrical meter

4

the appliance will not get full voltage

View Answer

Correct Answer: 2

Question: Rainbow is produced when sunlight fall on drops of rain. Which of the following physical phenomena a

1

Diffusion

2

Refraction

3

Internal reflection

4

View Answer

Correct Answer: 3

Question: Natural radioactivity was discovered by

1

Marie Curie

2

Ernest Rutherfor

3

Henri Becquerel

4

Enrico Fermi

View Answer

Correct Answer: 3

Question: Planets are

1

luminous heavenly bodies revolving around a star

2

non-luminous heavenly bodies

3

luminous heavenly bodies that twinkle

4

luminous heavenly bodies that do not twinkle

View Answer

Correct Answer: 2

Question: Light travels at the fastest speed in

1

glass

2

water

3

hydrogen

4

vacuum

View Answer

Correct Answer: 4

Question: Railway tracks are banked on curves

1

necessary centrifugal force may be obtained from the horizontal component weight of the train

2

to avoid frictional force between the tracks and wheels

3

necessary centripetal force may be obtained from the horizontal component of the weight of the train

4

the train may not fly off in the opposite direction

View Answer

Correct Answer: 3

Question: On a cold day when a room temperature is 15oC, the metallic cap of a pen becomes much colder than it

1

metals have higher thermal capacity than plastics

2

plastics have a lower density than metals

3

metals are good conductor of heat

4

plastics have a higher thermal conductivity than metals

View Answer

Correct Answer: 3

Question: Sound produced at a point is heard by a person after 5 second, while the same sound is heard by anot

1

1.8 km, 0.15 km

2

2.2 km, 0.20 km

3

2.8 km, 0.25 km

4

3.3 km, 0.30 km

View Answer

Correct Answer: 4

Question: Of the four locations mentioned below the highest inside temperature will be attained in the pressur

1

at sea level

2

at the top of Mt. Everest

3

at a place in a valley below sea level

4

in an aeroplane flying at a height of 10,000 m with inside pressure maintained at the sea level

View Answer

Correct Answer: 3

Question: Supersonic plane fly with the speed

1

less than the speed of sound

2

of sound

3

greater than the speed of sound

4

of light

View Answer

Correct Answer: 3

Question: Stars which appear single to the naked eye but are double when seen through a telescope are

1

novas and supernovas

2

binaries

3

asteroids

4

quasars

View Answer

Correct Answer: 2

Question: Intensity of sound at a point is its distance from the source.

1

directly proportional to

2

inversely proportional to

3

directly proportional to square of

4

inversely proportional to square of

View Answer

Correct Answer: 4

Question: Materials for rain-proof coats and tents owe their water-proof properties to

1

surface tension

2

viscosity

3

specific gravity

4

elasticity

View Answer

Correct Answer: 1

Question: On a clean glass plate a drop of water spreads to form a thin layer whereas a drop of mercury remain

1

mercury is a metal

2

density of mercury is greater than that of water

3

cohesion of mercury is greater than its adhesion with glass

4

cohesion of water is greater than its adhesion with glass

View Answer

Correct Answer: 3

Question: Suitable impurities are added to a semiconductor depending on its use. This is done in order to

1

increase its life

2

enable it to withstand higher voltages

3

increase its electrical conductivity

4

increase its electrical resistivity

View Answer

Correct Answer: 3

Question: Stars twinkle because

1

the intensity of light emitted by them changes with time

2

the distance of the stars from the earth changes with time

3

the refractive index of the different layers of the earth's atmosphere changes continuously, consequently the position of the image of a start changes with time

4

the light from the star is scattered by the dust particles and air molecules in the earth's atmosphere

View Answer

Correct Answer: 3

Question: It takes much longer to cook food in the hills than in the plains, because

1

in the hills the atmospheric pressure is lower than that in the plains and therefore water boils at a temperature lower than 100oC causing an increase in cooking time

2

due to low atmospheric pressure on the hills, the water boils at a temperature higher than 100oC and therefore water takes longer to boil

3

in the hills the atmospheric density is low and therefore a lot of heat is lost to the atmosphere

4

n the hills the humidity is high and therefore a lot of heat is absorbed by the atmosphere leaving very little heat for cooking

View Answer

Correct Answer: 1

Question: Of the following natural phenomena, tell which one known in Sanskrit as 'deer's thirst'?

1

Rainbow

2

Earthshine

3

Halo

4

Mirage

View Answer

Correct Answer: 4

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