Physics: MCQ Test (50 questions)

Question 1 of 50

Which of the following is not a result of atmospheric refraction?

Athe sun appearing two or three minutes before its actual sunrise
Bthe sun appears red at sunset
CThe sun appears higher in the sky than its actual height
Dtwinkling stars at night

Question 2 of 50

When a ray of light passes from a rarer medium to a denser medium, it-

Amoves in a straight direction
Bbends towards the normal.
Cmoves away from the normal
Dnone of these

Question 3 of 50

One horsepower (HP) consists of-

A200 W
B500 W
C700W
D746 W

Question 4 of 50

The ball keeps dancing in the water spray at the intersections because-

AAs the velocity of water increases, the pressure decreases.
BThe higher the velocity of the water, the higher the pressure
Cdue to the surface tension of water
Ddue to the viscosity of water

Question 5 of 50

What is the purpose of a thermostat?

AMeasuring Temperature
Braising the temperature
CKeeping the temperature stable
Dconverting heat into electricity

Question 6 of 50

Thermos flask keeps liquids hot for a long time because-

AIt is filled with gas that emits heat.
BThere is internal heating in it.
CDouble walls of radiant inner wall and outer cladding prevent heat from escaping or entering
Dnone of the above

Question 7 of 50

The lowest possible temperature is

AB35°C
B0°C
C- 300°C
D1°C

Question 8 of 50

Which instrument measures electrical resistance?

AAmmeter
Bpotentiometer
Cvoltameter
Dohm meter

Question 9 of 50

Rectifier is used for-

ATo convert high voltage to low voltage
BTo convert low voltage to high voltage
CTo convert DC to AC
DTo convert AC to DC

Question 10 of 50

In which direction does a freely suspended magnetic needle rest?

ANorth-west direction
BNorth South Direction
CNorth-East direction
DSouth-west direction

Question 11 of 50

Which of the following statements is correct? Velocity of sound-

ADoes not depend on the nature of the medium
BIt is maximum in gases and minimum in liquids
CIt is maximum in solids and minimum in liquids
DIt is maximum in solids and minimum in gases

Question 12 of 50

What will be the change in the volume of water if the temperature is dropped from 9°C to 3°C?

AThere will be no change in volume
BThe volume will first increase and then decrease
CThe volume will first decrease and then increase
Dthe water will freeze

Question 13 of 50

The value of latent heat of fusion of ice is-

A0.8 Cal/g
B8 Cal/g
C80 Cal/g
D536Cal/g

Question 14 of 50

What are atoms called that have the same number of protons but different numbers of neutrons?

Aisobaric
Bisomer
Csumneutronic
Disotopes

Question 15 of 50

When the Fortin barometer is taken to a high mountain, the mercury in the tube falls because-

AThe air here is relatively light.
BWith decrease in temperature the mercury level decreases
CThe atmospheric pressure there is low
Dthere the surface tension decreases

Question 16 of 50

Neutron was discovered by-

ARutherford
BThomson
CChadwick
DNewton

Question 17 of 50

The feeling of weightlessness in a spacecraft in orbit is due to-

ALack of external gravity
BThe acceleration in orbit is equal to the acceleration due to external gravity
CExternal gravity, but not inside the spacecraft
DSpacecraft in orbit lose energy

Question 18 of 50

When is the apparent weight of a person in a lift less than his actual weight?

AWhen the elevator is going down rapidly
BWhen the lift is coming down at the same speed
CWhen the lift is moving up at a constant speed
Dwhen the elevator is going up fast

Question 19 of 50

The force between two electric charges is related to-

AAmpere's law
BCoulomb's law:
CFaraday's law
DOhm's law

Question 20 of 50

In a three pin electrical plume the longest pin should be connected to-

Afrom the base end
BSanjeev from the beginning
Cfrom an indifferent head
Dfrom any end

Question 21 of 50

Which of the following is produced by converting solar energy using photovoltaic cells?

Aoptical energy
Belectrical energy
Cthermal energy
Dmechanical energy

Question 22 of 50

The rate of evaporation does not depend on-

Aat the temperature of the liquid
Bon the surface area of the liquid
Cover the entire volume of the liquid
Dat air pressure

Question 23 of 50

When a moving bus suddenly applies its brakes, the passengers inside are thrown forward. What can explain this?

Arelativity theory
BNewton's first law
CNewton's second law
DNewton's third law:

Question 24 of 50

Two plane mirrors are placed in a periscope-

Aparallel to each other
Bperpendicular to each other
Cmaking an angle of 60° with each other
Dmaking an angle of 45° with each other

Question 25 of 50

Which of the following colours has the maximum wavelength?

ABlue
BYellow
CGreen
DRed

Question 26 of 50

The work done to hold a 20 kg weight at a height of 1 m above the ground is

A20 joules
B200 joules
C981 joules
DZero Joules

Question 27 of 50

A stone is placed at the bottom of a cup filled with water. The apparent depth of the north is-

Aequal to its actual depth
BOrder by its actual depth
COrder by its actual depth
DEither A or C has one

Question 28 of 50

The voice of women is thinner than that of men because the voice of women-

Ahas a higher frequency
Bhas a greater wavelength.
Chas a greater amplitude
Dhas a greater velocity

Question 29 of 50

The speed of light is minimum while passing through which of the following?

Aglass
Bvacuum
CWater
DAir

Question 30 of 50

Which colour is dispersion more in rainbow?

APurple
BYellow
CRed
DBlue

Question 31 of 50

What is the instrument called that measures the intensity of the sun's rays?

AAstrometer
BCrescograph
CActiometer
Dbarometer

Question 32 of 50

Electricity resides in mercury lamp-

Amercury at low pressure
Bmercury at high pressure
CNeon and mercury
Dnone of these

Question 33 of 50

'Laser' is a device which is produced by-

Aspontaneous radiation
BDispersed radiation
Cscattered radiation
DStimulated radiation

Question 34 of 50

How would the height of a six feet tall person be expressed in nanometers? (approximately)

A183 x 106 Nanometer
B234 x 106 Nanometer
C183 x 107 Nanometer
D234 x 107 Nanometer

Question 35 of 50

Broken glass appears to be cracked.

ACauses of refraction
Bdue to reflection
Cdue to interference
Ddue to total internal reflection

Question 36 of 50

The rate of vaporization of a liquid does not depend on what?

Aat temperature
Bon humidity
Con its mass
Don its surface area raised in the atmosphere

Question 37 of 50

The heat emitted or absorbed which changes the state of matter but does not cause any change in temperature is called—

Aspecific heat
Babsorbed heat
Cheat emitted
Dlatent heat

Question 38 of 50

Any boat will sink if it removes water from its-

Aequal in volume
Bequal to the weight
Cequal to the back
Dequal to the density

Question 39 of 50

Consider the following statements about jet engines and rockets. 1. A jet engine uses ambient air for its oxygen supply. Therefore, it is unsuitable for space travel. 2. A rocket carries its oxygen supply in the form of gas and fuel. Which of the above statements is/are correct?

Aonly 1
Bonly 2
CBoth 1 and 2
DNeither 1 nor 2

Question 40 of 50

Which of the following is diamagnetic?

AIron
BBismuth
CNickel
DCobalt

Question 41 of 50

The colour of an opaque object is due to the colour it gives off.

Aabsorbs
Brefracts
Creflects
Dscatters

Question 42 of 50

In winter, when water freezes due to cold, then fish and other aquatic creatures-

ACan survive because only the top layer of water freezes
Bmove to other warmer places
Ccan survive safely because they have an innate ability to tolerate cold
Ddies

Question 43 of 50

When a solid body is immersed in water, its weight decreases. By how much is this loss?

Aequal to the weight of the displaced water
Bless than the weight of the displaced water
Cmore than the weight of the displaced water
DNot related to the weight of the displaced water

Question 44 of 50

The safety fuse wire used in domestic electrical appliances is made of the metal whose-

Aresistance is low
Bhave a lower melting point
Cthe specific density is low
Dconductivity is low

Question 45 of 50

Einstein was awarded the Nobel Prize for-

Afor photoelectric effect
BFor the theory of specific heats
CFor the special theory of relativity
Dfor Bose-Einstein statistics

Question 46 of 50

The algebraic sum of the currents meeting at a point in a circuit is-

Ainfinite
BZero
Cbetween zero and infinity
Dnone of the above

Question 47 of 50

The material of which a permanent magnet is made is—

Aferromagnetic
Bdiamagnetic
Cantiferromagnetic
DThe above three

Question 48 of 50

Wood immersed in water appears bent. This appearance is due to the following reasons:

Areflection of light
BDiffraction of light
Crefraction of light
DImmersion of light

Question 49 of 50

To a person sitting suspended in water, his leg appears bent and short.

ACauses of refraction
Bdue to reflection
CCauses of diffraction
Ddue to dispersion

Question 50 of 50

Einstein's equation E=mc represents-

Aof sound velocity
Bof the speed of light
Cof light wavelength
Dconstant