Physics: MCQ Test (25 questions)

Question 1 of 25

The alpha particle has two units of positive charge. Its mass is approximately equal to-

Aof two protons
Bof an atom of helium
CThe sum of the masses of two positrons and two neutrons
Dof two positrons because each positron has only one positive charge.

Question 2 of 25

Which one of the following is not a unit of energy?

AJoule
Bwatt-hour
CNewton meter
Dkilogram-meter/second2

Question 3 of 25

Which instrument is used to measure the humidity of air?

AHygrometer
BHydrometer
CManometer
Dodometer

Question 4 of 25

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 5 of 25

'Faraday's law' is related to-

Aby electrolysis
Bby the pressure of gases
Cby electrical disconnection
Dby electrical propagation

Question 6 of 25

On passing through a prism, the rays of sunlight get divided into different colours.

Alight rays are electromagnetic waves
BThe rays diverge at the two surfaces of the prism.
CThe rays are refracted on the two surfaces of the prism.
DRays of different colours have different deviations.

Question 7 of 25

If a person cannot see distant objects clearly, what defect will he have in his vision?

Along-sightedness
Bnearsightedness
Cvision [astigmatism]
Dnone of these

Question 8 of 25

Laser beam is used for-

ALaser beam is used
Bin cardiac medicine
Cin eye medicine
DIn kidney therapy

Question 9 of 25

The SI unit of energy is-

AJoule
BNewton
CHertz
DPascal

Question 10 of 25

Which one of the following statements is not correct about sound?

Asound travels slower than the speed of light
BSound travels faster in humid air than in dry air
Csound waves are longitudinal waves
Dsound waves are longitudinal waves

Question 11 of 25

The colour of light is determined by its-

ABy dimension
Bby wavelength
Cintensely
Dwith speed

Question 12 of 25

Which of the following statements is not correct for light rays?

Alight travels at different speeds in different media
BLight travels in air at a speed of about 300 million meters per second
CAs light leaves the surface of water and enters the air, its speed slows down
DAs light leaves the glass surface and enters the air, its speed increases

Question 13 of 25

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 14 of 25

Used to drive away insects and harmful elements from homes

Aultrasonic wave
Bradio waves
Cinfrared wave
DSubsonic wave

Question 15 of 25

The wall below the dam is made thick because-

AThe pressure of the liquid increases with increasing depth
Bfluid pressure decreases with increasing depth
CThe density of the liquid increases with increasing depth.
DThe density of a liquid decreases with increasing depth

Question 16 of 25

It is measured by the work done in moving a unit positive charge from one point to another in an electric circuit, the distance between those points-

Ato resistance
Bto the potential difference
Cto the stream
Dthe strength of the electric current

Question 17 of 25

Ice floats in water but sinks in alcohol because-

AWater is more transparent than alcohol
BIce is formed by the freezing of water
CIce is a solid while alcohol is a liquid
DIce is lighter than water and heavier than alcohol

Question 18 of 25

What is the conductivity of a superconductor?

AUnlimited
BLess
CZero
DMore

Question 19 of 25

Which of the following colours can be obtained by mixing green and red colours?

ABlue
BMagenta
Cpink
DYellow

Question 20 of 25

The fluctuations in the frequency of a sound source are called-

ARaman effect
BDoppler effect
CCrampton effect
Dphotoelectric effect

Question 21 of 25

Consider the following statements. Hypermetropia is a defect of vision in which 1. A person cannot see distant objects clearly as the near point of the eye moves away from its normal position. 2. A person cannot see nearby objects clearly as the near point of the eye moves away from its normal position. 3. The near point of the eye moves away from its normal position. 4. The far point of the eye moves towards the eye. Which of the above statements are correct?

Aand 3
B2 and 4
C1 and 4
D2 and 3

Question 22 of 25

Angular momentum is equal to

Amoment of inertia x angular velocity
Bmass x angular velocity
Clinear velocity x angular velocity
Dmass x linear velocity

Question 23 of 25

The reason for the water temperature being higher at the bottom of the waterfall than at the top is-

AWater has more potential energy at the bottom
BProvides surface heat to the ground surface
CThe kinetic energy of falling water is converted into heat.
DFalling water absorbs heat from the surroundings

Question 24 of 25

Which of the following are used as electrolytes in a dry match (battery)?

AAmmonium chloride and zinc chloride
Bsodium chloride and calcium chloride
CMagnesium Chloride and Zinc Chloride
DAmmonium chloride and calcium chloride

Question 25 of 25

The presence of moisture in the atmosphere is ascertained by observing water droplets on the outer surface of a steel glass filled with-

Awith warm milk
Bwith hot water
Cwith cold water
Dfrom normal water