Rectifiers are used to convert

Direct current to Alternating current

Alternating current to Direct current

Planets do not twinkle because

they emit light of a constant intensity

their distance from the earth does not change with time

they are very far away from the earth resulting in decrease in intensity of light

they are nearer to earth and hence we receive a greater amount of light and, therefore minor variations in the intensity are not noticeable

Out of the following pairs, choose the pair in which the physical quantities do not have identical dimension?

Force and rate of change of linear momentum

Planck's constant and Angular momentum

Force and rate of change of linear momentum

Stars appears to move from east to west because

the earth rotates from east to west

all stars move from east to west

the earth rotates from west to east

the earth rotates from east to west

the background of the stars moves from west to east

Intensity of sound has

both subjective and objective existence

magnetic disturbances in the atmosphere

unequal heating of different parts of the atmosphere

magnetic disturbances in the atmosphere

depletion of ozone layer in the atmosphere

equal heating of different parts of the atmosphere

Point A is at a lower electrical potential than point B. An electron between them on the line joining them will

move at right angles to the line joining A and B

receiving a signals in a radio receiver

locating geostationary satellites

detecting and locating the position of objects such as aeroplanes

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

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

sand is soft and concreter is hard

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

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

the sand is grainy but concrete is smooth

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

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

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

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

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

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

On a clean glass plate a drop of water spreads to form a thin layer whereas a drop of mercury remains almost spherical because

cohesion of water is greater than its adhesion with glass

density of mercury is greater than that of water

cohesion of mercury is greater than its adhesion with glass

cohesion of water is greater than its adhesion with glass

Stars twinkle because

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

the intensity of light emitted by them changes with time

the distance of the stars from the earth changes with time

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

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

Inside an aeroplane, flying at a high altitude,

the pressure inside is less than the pressure outside

the pressure is the same as that outside

normal atmospheric pressure is maintained by the use of air pumps

the pressure inside is less than the pressure outside

normal humidity and partial vacuum are maintained

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

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

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

the rolling friction is much less than the sliding friction

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

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

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

increase its electrical resistivity

enable it to withstand higher voltages

increase its electrical conductivity

increase its electrical resistivity

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

the diffusion of oil through the wick

On a cold day when a room temperature is 15oC, the metallic cap of a pen becomes much colder than its plastic body, though both are at the same temperature of 15oC, because

plastics have a higher thermal conductivity than metals

metals have higher thermal capacity than plastics

plastics have a lower density than metals

metals are good conductor of heat

plastics have a higher thermal conductivity than metals

Railway tracks are banked on curves

the train may not fly off in the opposite direction

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

to avoid frictional force between the tracks and wheels

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

the train may not fly off in the opposite direction

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

work done in rolling is more than in lifting

work done in lifting the stone is equal to rolling it

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

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

Large transformers, when used for some time, become very hot and are cooled by circulating oil. The heating of the transformer is due to

the heating effect of current alone

both the heating effect of current and hysteresis loss

2016 + Mcqs in Physics in General Knowledge Page 40 McqOptions

1951.	Pick out the scalar quantity
A.	force
B.	pressure
C.	velocity
D.	acceleration
Answer» C. velocity

1952.	If two bodies of different masses, initially at rest, are acted upon by the same force for the same time, then the both bodies acquire the same
A.	velocity
B.	momentum
C.	acceleration
D.	kinetic energy
Answer» C. acceleration

1953.	Rectifiers are used to convert
A.	Direct current to Alternating current
B.	Alternating current to Direct current
C.	high voltage to low voltage
D.	low voltage to high voltage
Answer» C. high voltage to low voltage

1954.	Metals are good conductors of electricity because
A.	they contain free electrons
B.	the atoms are lightly packed
C.	they have high melting point
D.	All of the above
Answer» B. the atoms are lightly packed

1955.	Sound waves in air are
A.	transverse
B.	longitudinal
C.	electromagnetic
D.	polarised
Answer» C. electromagnetic

1956.	Planets do not twinkle because
A.	they emit light of a constant intensity
B.	their distance from the earth does not change with time
C.	they are very far away from the earth resulting in decrease in intensity of light
D.	they are nearer to earth and hence we receive a greater amount of light and, therefore minor variations in the intensity are not noticeable
Answer» E.

1957.	Out of the following pairs, choose the pair in which the physical quantities do not have identical dimension?
A.	Pressure and Young's modules
B.	Planck's constant and Angular momentum
C.	Impulse and moment of force
D.	Force and rate of change of linear momentum
Answer» D. Force and rate of change of linear momentum

1958.	Stars appears to move from east to west because
A.	all stars move from east to west
B.	the earth rotates from west to east
C.	the earth rotates from east to west
D.	the background of the stars moves from west to east
Answer» C. the earth rotates from east to west

1959.	Let a thin capillary tube be replaced with another tube of insufficient length then, we find water
A.	will overflow
B.	will not rise
C.	depressed
D.	change its meniscus
Answer» C. depressed

1960.	Pa(Pascal) is the unit for
A.	thrust
B.	pressure
C.	frequency
D.	conductivity
Answer» C. frequency

1961.	An aeroplane is flying horizontally with a velocity of 600 km/h and at a height of 1960 m. When it is vertically at a point A on the ground a bomb is released from it. The bomb strikes the ground at point B. The distance AB is
A.	1200 m
B.	0.33 km
C.	3.33 km
D.	33 km
Answer» D. 33 km

1963.	Minimum number of unequal vectors which can give zero resultant are
A.	two
B.	three
C.	four
D.	more than four
Answer» C. four

1965.	Nuclear sizes are expressed in a unit named
A.	Fermi
B.	angstrom
C.	newton
D.	tesla
Answer» B. angstrom

1966.	Light from the Sun reaches us in nearly
A.	2 minutes
B.	4 minutes
C.	8 minutes
D.	16 minutes
Answer» D. 16 minutes

1969.	On a rainy day, small oil films on water show brilliant colours. This is due to
A.	dispersion
B.	interference
C.	diffraction
D.	polarization
Answer» C. diffraction

1962.	Intensity of sound has
A.	an object existence
B.	a subject existence
C.	no existence
D.	both subjective and objective existence
Answer» B. a subject existence

1964.	Light year is a unit of
A.	time
B.	distance
C.	light
D.	intensity of light
Answer» C. light

1967.	Mirage is due to
A.	unequal heating of different parts of the atmosphere
B.	magnetic disturbances in the atmosphere
C.	depletion of ozone layer in the atmosphere
D.	equal heating of different parts of the atmosphere
Answer» B. magnetic disturbances in the atmosphere

1968.	Point A is at a lower electrical potential than point B. An electron between them on the line joining them will
A.	move towards A
B.	move towards B
C.	move at right angles to the line joining A and B
D.	remain at rest
Answer» C. move at right angles to the line joining A and B

1970.	RADAR is used for
A.	locating submerged submarines
B.	receiving a signals in a radio receiver
C.	locating geostationary satellites
D.	detecting and locating the position of objects such as aeroplanes
Answer» E.

1971.	Lux is the SI unit of
A.	intensity of illumination
B.	luminous efficiency
C.	luminous flux
D.	luminous intensity
Answer» B. luminous efficiency

1972.	Magnetism at the centre of a bar magnet is
A.	minimum
B.	maximum
C.	zero
D.	minimum or maximum
Answer» D. minimum or maximum

1973.	It is more difficult to walk on a sandy road than on a concrete road because
A.	sand is soft and concreter is hard
B.	the friction between sand and feet is less than that between concrete and feet
C.	the friction between sand and feet is more than that between concrete and feet
D.	the sand is grainy but concrete is smooth
Answer» C. the friction between sand and feet is more than that between concrete and feet

1974.	One thousand microns is equal to
A.	10^-3m
B.	10^-6m
C.	10^-9m
D.	10^-12m
Answer» B. 10^-6m

1975.	Of the following natural phenomena, tell which one known in Sanskrit as 'deer's thirst'?
A.	Rainbow
B.	Earthshine
C.	Halo
D.	Mirage
Answer» E.

Explore topic-wise MCQs in General Knowledge.

Pick out the scalar quantity

If two bodies of different masses, initially at rest, are acted upon by the same force for the same time, then the both bodies acquire the same

Rectifiers are used to convert

Metals are good conductors of electricity because

Sound waves in air are

Planets do not twinkle because

Out of the following pairs, choose the pair in which the physical quantities do not have identical dimension?

Stars appears to move from east to west because

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

Pa(Pascal) is the unit for

An aeroplane is flying horizontally with a velocity of 600 km/h and at a height of 1960 m. When it is vertically at a point A on the ground a bomb is released from it. The bomb strikes the ground at point B. The distance AB is

Intensity of sound has

Minimum number of unequal vectors which can give zero resultant are

Light year is a unit of

Nuclear sizes are expressed in a unit named

Light from the Sun reaches us in nearly

Mirage is due to

Point A is at a lower electrical potential than point B. An electron between them on the line joining them will

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

RADAR is used for

Lux is the SI unit of

Magnetism at the centre of a bar magnet is

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

One thousand microns is equal to

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

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

Moment of inertia is

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

On a clean glass plate a drop of water spreads to form a thin layer whereas a drop of mercury remains almost spherical because

Stars twinkle because

Sound produced at a point is heard by a person after 5 second, while the same sound is heard by another person after 6 seconds. If the speed of sound is 300 m/s, what could be the maximum and minimum distances between the two persons?

Mach number is used in connection with the speed of

Find the maximum velocity for the overturn of a car moving on a circular track of radius 100 m. The co-efficient of friction between the road and tyre is 0.2

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

Rainbow is produced when sunlight fall on drops of rain. Which of the following physical phenomena are responsible for this? I. Diffusion II. RefractionIII. Internal reflection

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

Inside an aeroplane, flying at a high altitude,

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

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

Sound travels at the fastest speed in