Physics: MCQ Test (25 questions)

Question 1 of 25

Which of the following pairs is correctly matched?

ASeismograph – records the intensity of earthquake tremors
BPycnometer – measuring solar radiation
CPyrometer – measuring the density of a liquid
DPyrheliometer – measuring high temperatures

Question 2 of 25

If a clock oscillating with a pendulum is taken from the Earth to the Moon, then the clock will be-

ALazy
BQuick
Cwill give the same time as Earth
Dwill stop working

Question 3 of 25

If the boiling point of water in Delhi is 100°C, what will be the temperature of water in Mussoorie?

A100°C
Bless than 100°C
CMore than 100°C
DAll is false

Question 4 of 25

Which law of physics states that when the distance between two electric charges is doubled, the force between them reduces to one-fourth of its original value?

ACoulomb's law
BPascal's law
CStefan's law
DHooke's law

Question 5 of 25

The temperature of a liquid increases due to its vaporization.

Awill increase
Bwill decrease
Cwill grow rapidly
Dwill remain unchanged

Question 6 of 25

The change of a solid substance directly into vapor state without changing into liquid is called-

AKvdhan
BDistillation
CUplift
DPolymerization

Question 7 of 25

Steam burns are more painful (serious) than boiling water burns.

ASteam has latent heat,
BSteam is a type of gas and it immerses the body quickly.
CSteam easily enters the body through the pores present in the body.
DSteam has a very high temperature

Question 8 of 25

The temperature at a place on a sunny day is 113 on the Fahrenheit scale. What is the Kelvin scale reading of this temperature?

A318K
B45K
C62.8K
D335.8K

Question 9 of 25

Which of the following statements is false?

AThere is repulsion between like poles of a magnet
BThere is attraction between opposite poles of a magnet
CAn isolated pole does not exist
DIf a magnet is broken in half, its two poles separate.

Question 10 of 25

If a magnet has a third pole, then the third pole is called—

AAdditional pole
BRandom poles
CFaulty pole
Dresultant pole

Question 11 of 25

What is the colour of the light emitted by the Sun?

AWhite
BRed
CYellow
Dorange

Question 12 of 25

Which optical instrument is used to observe distant objects?

ASimple microscope
Bcompound microscope
Celectron microscope
DVisionary

Question 13 of 25

Cyclotron is a device which-

AProvides energy to charged particles.
BMeasures the speed of vehicles
Ctakes two-dimensional pictures
DMeasures the amount of water vapor.

Question 14 of 25

Which of the following metals is used as a semiconductor in transistors?

ACopper
BGermanium
Cgraphite
DSilver

Question 15 of 25

Consider the following phenomena: 1. Size of the Sun at dusk 2. Colour of the Sun at dawn 3. Appearance of the Moon at dawn 4. Twinkling of stars in the sky 5. Appearance of the Pole Star in the sky Which of the above are optical illusions?

A1, 2 and 3
B3, 4 and 5
C1, 2 and 4
D2, 3 and 5

Question 16 of 25

What effect does the addition of impurities have on the melting point?

Aincreases
Bdecreases
Cremains unchanged
Dnone of these

Question 17 of 25

An electrical fuse wire must have which of the following property sets for general applications?

AThick wire, high melting point alloy, short length
BThick wire, low melting point alloy, greater length
CShort elongation, low melting point alloy, thin wire
DLonger length, lower melting point alloy, thinner wire

Question 18 of 25

What is the coating of zinc on iron called?

Agalvanization
Belectroplating
CIonization
DNone of these

Question 19 of 25

An egg sinks in soft water but floats in a concentrated salt solution because-

AThe egg absorbs salt from the solution and expands
BThe albumin dissolves in the salt solution and the egg becomes lighter.
CThe density of the salt solution becomes greater than the density of the egg.
DWater has high surface tension.

Question 20 of 25

Boiling Point of Water-

Ais always 100°C
Bdepends on the material of the container
Cdepends on the relative humidity
Ddepends on the pressure above the open surface of water

Question 21 of 25

A liquid droplet assumes a spherical shape

Adue to surface tension
Bdue to viscosity
Cdue to upward thrust
Ddue to gravity

Question 22 of 25

There is no atmosphere on the Moon because-

AIt is near the Earth
Bit revolves around the sun
CIt gets light from the sun.
DHere the escape velocity of atoms is less than their root mean square velocity

Question 23 of 25

The electricity consumption bill is based on the measurement of 1. Wattage 2. Voltage 3. Ohm 4. Ampere Choose the correct answer from the codes given below:

Aonly 1
B1 and 2
C2 and 3
D1 and 4

Question 24 of 25

In isotopic atoms-

Ahave the same number of protons
Bhave the same number of neutrons
Chave the same number of nucleons
DAll are true

Question 25 of 25

The function of 'thermostat' in a refrigerator is-

ALowering the temperature
Bincrease freezing temperature
Cmaintain a consistent temperature
DDecreasing the melting point