Class X Physics Quizzes -

BCSE PHYSICS 2022

Contains MCQ and short answer type Questions from BCSE Exam 2022 with answers and explanation.

1 / 18

Blowing over the surface of hot tea will

establish thermal equilibrium between tea and the surrounding.

make the tea lose heat.

facilitate a greater rate of heat transfer by increasing the temperature gradient.

remove air particles and heat.

The correct answer is:

make the tea lose heat.

Blowing over the surface of hot tea increases the rate of evaporation, which enhances heat loss from the tea. The movement of air helps to carry away the warmer air above the surface, allowing the tea to lose heat more effectively.

The correct answer is:

make the tea lose heat.

2 / 18

One of the benefits of using a hydraulic machine is the multiplication of

force

speed

fuel efficiency

operating time

The correct answer is:

force.

Hydraulic machines use fluid pressure to multiply force, allowing them to lift heavy loads with less input force. This is the main benefit of hydraulic systems.

Awesome! you are correct!

The correct answer is:

force.

Hydraulic machines use fluid pressure to multiply force, allowing them to lift heavy loads with less input force. This is the main benefit of hydraulic systems.

3 / 18

The position of the centre of gravity of a body will not change with the change in a body’s shape.

False

True

False - The position of the center of gravity of a body can change with changes in the body's shape or mass distribution.

You are right!

False - The position of the center of gravity of a body can change with changes in the body's shape or mass distribution.

4 / 18

One of the applications of space exploration is to find the evidence of life elsewhere. The four main requirements for life in the universe is identified as

I liquid water and energy sources

II liquid water and sun’s radiation

III energy sources and high temperature

IV nutrients and protection from elements

II and III

IV and I

I and II.

III and IV

liquid water and energy sources
IV. nutrients and protection from elements

These are the four main requirements for life:

Liquid water – essential for biochemical reactions.
Energy sources – needed to drive biological processes.
Nutrients – to build and sustain life.

Protection from elements – to shield life from harmful environmental factors like radiation and extreme temperatures.

WOW ! You are good 🙂

liquid water and energy sources
IV. nutrients and protection from elements

These are the four main requirements for life:

Liquid water – essential for biochemical reactions.
Energy sources – needed to drive biological processes.
Nutrients – to build and sustain life.

Protection from elements – to shield life from harmful environmental factors like radiation and extreme temperatures.

5 / 18

Electromagnetic (EM) radiation has different wavelengths and frequencies. Which form of EM radiation has the highest penetrating ability?

gamma rays

radio waves

infrared radiation

microwaves

The correct answer is:

gamma rays.

Gamma rays have the highest energy and the shortest wavelength among electromagnetic radiation, giving them the greatest penetrating ability. They can penetrate most materials, including human tissue, and are used in medical treatments and imaging.

You are doing great!

The correct answer is:

gamma rays.

6 / 18

Which best supports the efficient and sustainable use of energy?

latest technology and fossil fuel

incandescent bulbs and insulation

energy-efficient appliances and insulation

conventional ovens and LED bulbs

The correct answer is:

energy-efficient appliances and insulation

Energy-efficient appliances use less electricity, and insulation helps maintain temperature, reducing the need for heating or cooling. Together, they support efficient and sustainable energy use.

Hats off ! that corrct.

The correct answer is:

energy-efficient appliances and insulation

Energy-efficient appliances use less electricity, and insulation helps maintain temperature, reducing the need for heating or cooling. Together, they support efficient and sustainable energy use.

7 / 18

Name the law that establishes the relationship between masses of two bodies and the distance between them.

Law of inertia

Newton’s law of gravitational constant

Newton’s universal law of gravitation

Newton’s laws of motion

The correct answer is:

Newton’s universal law of gravitation

This law states that every particle in the universe attracts every other particle with a force that is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centers.

BINGO !

The correct answer is:

Newton’s universal law of gravitation

8 / 18

Work is done whenever a force is applied on an object.

False

True

False - Work is done only when a force causes displacement in the direction of the force. If there is no displacement, no work is done.

9 / 18

A mysterious radiation penetrates through soft tissues and skin. Which one of the following shows its harmful effect and a useful application.

I Over exposure to the radiation causes HIV.

II Over exposure to the radiation causes cancer.

III Normal levels of radiation can be used for sterilizing needles.

IV Limited doses of radiation can be used for imaging internal body parts.

I and IV

II and III

II and IV

I and III

The correct answer is:

II and IV

II. Overexposure to the radiation causes cancer – Certain types of radiation, such as X-rays and gamma rays, can cause cancer due to DNA damage when exposure is excessive.

IV. Limited doses of radiation can be used for imaging internal body parts – Medical imaging techniques like X-rays and CT scans use controlled doses of radiation to visualize internal structures safely.

Awesome !

The correct answer is:

II and IV

II. Overexposure to the radiation causes cancer – Certain types of radiation, such as X-rays and gamma rays, can cause cancer due to DNA damage when exposure is excessive.

10 / 18

Electrical appliances such as hair dryers, water boilers and heaters have high resistance wire with high melting point.

True

False

True - Electrical appliances like hair dryers and heaters use high-resistance wire that can withstand high temperatures without melting.

11 / 18

A transformer with more number of turns in secondary coil will have thicker secondary coil.

True

False

False - A transformer with more turns in the secondary coil does not necessarily have a thicker wire; the thickness of the wire is more related to the current it needs to carry, not just the number of turns.

12 / 18

Name the law that establishes the relationship between masses of two bodies and the distance between them.

Newton’s universal law of gravitation

Newton’s law of gravitational constant

Law of inertia

Newton’s laws of motion

The correct answer is:

Newton’s universal law of gravitation

BINGO !

The correct answer is:

Newton’s universal law of gravitation

13 / 18

While pedalling a bicycle, the forces applied are parallel to each other.

True

False

True :While pedaling a bicycle, the forces applied by the legs are generally parallel to each other, pushing down on the pedals.

While pedaling a bicycle, the forces applied by the legs are generally parallel to each other, pushing down on the pedals.

14 / 18

If uranium ( ₉₂U ²³⁸ ) ejects a beta (β) particle, how many protons are left in the new element?

93 protons

91 protons

92 protons

90 protons

The correct answer is:

93 protons.

When uranium-238 (92238U^{238}_{92}U92238U) ejects a beta (β) particle, a neutron in the nucleus is converted into a proton. As a result, the number of

protons increases by 1. Therefore, the new element formed will have 93 protons, which is neptunium (Np).

The correct answer is:

93 protons.

When uranium-238 (92238U^{238}_{92}U92238U) ejects a beta (β) particle, a neutron in the nucleus is converted into a proton. As a result, the number of

protons increases by 1. Therefore, the new element formed will have 93 protons, which is neptunium (Np).

Awesome!

15 / 18

For bodies having same area of base, the stability is maximum when the position of centre of gravity is

at the lower part

at the top.

outside the body.

within the body.

The correct answer is:

at the lower part.

For maximum stability, the center of gravity should be as low as possible. A lower center of gravity makes a body more stable and less likely to tip over.

The correct answer is:

at the lower part.

For maximum stability, the center of gravity should be as low as possible. A lower center of gravity makes a body more stable and less likely to tip over.

16 / 18

Telescope X uses mirrors to focus the light of an image and telescope Y uses lenses to magnify the image. What type of telescopes are X and Y?

Both X and Y are reflecting telescopes.

X is a refracting telescope and Y is a reflecting telescope.

Both X and Y are catadioptric telescopes.

X is a reflecting telescope and Y is a refracting telescope.

The correct answer is:

X is a reflecting telescope and Y is a refracting telescope.

Reflecting telescope (X): Uses mirrors to gather and focus light.

Refracting telescope (Y): Uses lenses to magnify the image.

The correct answer is:

X is a reflecting telescope and Y is a refracting telescope.

Reflecting telescope (X): Uses mirrors to gather and focus light.

Refracting telescope (Y): Uses lenses to magnify the image.

17 / 18

Two light bulbs X and Y are identical in all respects except that the filament of bulb X is thicker than Y. If the same potential difference is applied to both the bulbs, then

X will produce less heat as it has greater resistance.

Y will produce more heat as it has higher resistance.

X will produce more heat as it has lower resistance.

Both the bulbs will produce same amount of heat.

The correct answer is:

X will produce more heat as it has lower resistance.

The thicker filament in bulb X means it has lower resistance compared to Y. When the same potential difference is applied, the bulb with lower resistance (X) will allow more current to flow through it, producing more heat according to Joule's law, H=I²RtH = I^2 R tH=I²Rt.

The correct answer is:

X will produce more heat as it has lower resistance.

18 / 18

The amount of heat gained or lost by a body depends upon specific heat capacity, difference in temperature and

density of the body

mass of the body

weight of the body.

volume of the body

The correct answer is:

mass of the body.

The amount of heat gained or lost by a body is directly proportional to its mass, the specific heat capacity, and the temperature change. The formula is Q=mcΔTQ = mc\Delta TQ=mcΔT, where QQQ is the heat, mmm is the mass, ccc is the specific heat capacity, and ΔT\Delta TΔT is the temperature change.

Well done !

The correct answer is:

mass of the body.

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BCSE PHYSICS 2021

This contains MCQ and short answer type questions from BCSE 2021 with Answers and explanations!

1 / 16

The output power in a transformer is always obtained in the primary coil.

True

False

FALSE - The output power in a transformer is typically obtained from the secondary coil, not the primary coil. The primary coil receives input power, while the secondary coil delivers output power.

2 / 16

While opening a door, the force you apply is greater if you open it from the part closer to the hinges.

True

False

FALSE - When opening a door, applying force farther from the hinges requires less force due to the lever principle; thus, the force is greater when you open it from the part farther from the hinges.

3 / 16

The base of a vehicle is kept low, wide and heavy to increase its stability.

True

False

TRUE - A low, wide, and heavy base helps increase a vehicle's stability by lowering its center of gravity and increasing the area of support.

4 / 16

Shorter length of a conductor will increase the efficiency of electrical appliances.

True

False

TRUE - A shorter length of a conductor generally reduces resistance, which can increase the efficiency of electrical appliances

5 / 16

The fastest man in the world, Usain Bolt completed 100 m in 9.58 seconds. This means he had more power compared to other sprinters.

True

False

TRUE - Usain Bolt's completion of 100 m in 9.58 seconds indicates he generated more power compared to other sprinters, as power is the rate of doing work or transferring energy.

6 / 16

A crane pulls up a car of mass 500 kg to a height shown in the figure below in 50 seconds. What is the power developed by the crane? Take g =10 m/s2

200 W

300 W

400 W

500 W

Here's a step-by-step breakdown of how to calculate the power developed by the crane:

Calculate the Work Done (Potential Energy Gained): The work done against gravity to lift the car can be calculated using the formula for gravitational potential energy:
Work Done=mass×g×height\text{Work Done} = \text{mass} \times g \times \text{height}Work Done=mass×g×height
- Mass (mmm) = 500 kg
- Acceleration due to gravity (ggg) = 10 m/s²
- Height (hhh) = 4 m
Plugging in the values:
Work Done=500 kg×10 m/s2×4 m=20000 Joules\text{Work Done} = 500 \, \text{kg} \times 10 \, \text{m/s}^2 \times 4 \, \text{m} = 20000 \, \text{Joules}Work Done=500kg×10m/s2×4m=20000Joules
Calculate the Power Developed: Power is defined as the rate of doing work, which can be calculated using the formula:
Power=Work DoneTime\text{Power} = \frac{\text{Work Done}}{\text{Time}}Power=TimeWork Done
- Time = 50 seconds

Plugging in the values:
Power=20000 J50 s=400 W\text{Power} = \frac{20000 \, \text{J}}{50 \, \text{s}} = 400 \, \text{W}Power=50s20000J=400W

Here's a step-by-step breakdown of how to calculate the power developed by the crane:

Calculate the Work Done (Potential Energy Gained): The work done against gravity to lift the car can be calculated using the formula for gravitational potential energy:
Work Done=mass×g×height\text{Work Done} = \text{mass} \times g \times \text{height}Work Done=mass×g×height
- Mass (mmm) = 500 kg
- Acceleration due to gravity (ggg) = 10 m/s²
- Height (hhh) = 4 m
Plugging in the values:
Work Done=500 kg×10 m/s2×4 m=20000 Joules\text{Work Done} = 500 \, \text{kg} \times 10 \, \text{m/s}^2 \times 4 \, \text{m} = 20000 \, \text{Joules}Work Done=500kg×10m/s2×4m=20000Joules
Calculate the Power Developed: Power is defined as the rate of doing work, which can be calculated using the formula:
Power=Work DoneTime\text{Power} = \frac{\text{Work Done}}{\text{Time}}Power=TimeWork Done
- Time = 50 seconds

Plugging in the values:
Power=20000 J50 s=400 W\text{Power} = \frac{20000 \, \text{J}}{50 \, \text{s}} = 400 \, \text{W}Power=50s20000J=400W

7 / 16

A stone suspended on a string is placed under the surface of water. If the stone is lowered deeper into the liquid, which is true?

Pressure increase Depth increases

Pressure increase Density of liquid decreases

Pressure decreases Mass of the stone increases

Pressure remains same Surface area of stone decreases

The correct answer is A) Pressure increases as depth increases.

According to the principles of fluid mechanics, the pressure exerted by a liquid increases with depth due to the weight of the liquid above. So, as the stone is lowered deeper into the water, the pressure on it increases. The other options are incorrect because the density of the liquid remains constant, the mass of the stone doesn't change, and the surface area of the stone is unaffected by its depth.

The correct answer is A) Pressure increases as depth increases.

8 / 16

Different types of spacecrafts are used for various space exploration purposes. The Perseverance rover of NASA landed successfully on the surface of Mars on 18 February 2021. One purpose of the rover was to

study the signs of human activity on Mars

hunt for signs of past microbial life on Mars

look for signs of past water activity on Mars

search for soil and rocks sample on Mars

The correct answer is B) hunt for signs of past microbial life on Mars.

NASA's Perseverance rover was designed primarily to search for signs of ancient microbial life on Mars. It aims to study the planet's geology and climate, collect samples of Martian soil and rocks, and prepare for future human exploration. Although it also investigates signs of past water activity and collects samples, its main goal is to explore the potential for past life on the Red Planet.

The correct answer is B) hunt for signs of past microbial life on Mars.

9 / 16

Bucket P contains hot water at 93.1°C and Q contains cold water at 24.8°C. When the same volume of water is mixed, the temperature of the mixture will be

higher than P

higher than Q

equal to P

equal to Q

The correct answer is B) higher than Q.

When hot water and cold water are mixed, the final temperature of the mixture will be between the temperatures of the two, but closer to the temperature of the water with a larger thermal capacity. Since bucket P contains hot water at 93.1°C and bucket Q contains cold water at 24.8°C, the mixture’s temperature will be higher than the cold water in Q (24.8°C), but lower than the hot water in P (93.1°C).

The correct answer is B) higher than Q.

10 / 16

What happens to the atomic number of an element after emitting an alpha particle and a beta particle?

increases by 1

decreases by 1

decreases by 2

remains the same

The correct answer is A) increases by 1.

Alpha particle emission: When an element emits an alpha particle (which consists of 2 protons and 2 neutrons), its atomic number decreases by 2.
Beta particle emission: When an element emits a beta particle (which is an electron), a neutron in the nucleus is converted into a proton, increasing the atomic number by 1.

If an element emits both an alpha particle and a beta particle, the overall change in the atomic number will result in an increase of 1 (a decrease of 2 from alpha decay and an increase of 1 from beta decay).

The correct answer is A) increases by 1.

Alpha particle emission: When an element emits an alpha particle (which consists of 2 protons and 2 neutrons), its atomic number decreases by 2.
Beta particle emission: When an element emits a beta particle (which is an electron), a neutron in the nucleus is converted into a proton, increasing the atomic number by 1.

11 / 16

The electromagnetic spectrum is a continuum of all electromagnetic waves arranged according to frequency and wavelength. The correct order of waves in increasing order of frequency is

visible light < radio waves < ultraviolet rays < microwaves.

ultraviolet rays < visible light < radio waves < microwaves.

radio waves < microwaves < visible light < ultraviolet rays

microwaves < radio waves < visible light < ultraviolet rays

The correct answer is C) radio waves < microwaves < visible light < ultraviolet rays.

This order represents the correct sequence of electromagnetic waves arranged by increasing frequency. Radio waves have the lowest frequency, followed by microwaves, then visible light, and ultraviolet rays have a higher frequency than visible light.

The correct answer is C) radio waves < microwaves < visible light < ultraviolet rays.

12 / 16

“X” states that the magnitude of an induced emf is directly proportional to the rate of change of the magnetic field through the circuit. The law “X” is

Lenz’s law

Ampere’s law

Faraday’s law.

Fleming’s law.

The correct answer is C) Faraday’s law.

Faraday’s law of electromagnetic induction states that the magnitude of the induced electromotive force (emf) in a circuit is directly proportional to the rate of change of the magnetic flux through the circuit.

The correct answer is C) Faraday’s law.

13 / 16

The amount of heat absorbed or evolved by a body is given by 𝑄 = 𝑚𝑐∆𝑇. What does the variable ‘c’ stand for?

calorimeter

heat capacity

latent heat capacity

specific heat capacity

The correct answer is D) specific heat capacity.

In the equation Q=mcΔTQ = mc\Delta TQ=mcΔT, the variable ccc represents the specific heat capacity, which is the amount of heat required to raise the temperature of 1 kg of a substance by 1°C (or 1 K).

The correct answer is D) specific heat capacity.

14 / 16

When a couple acts on a body it produces

rotational motion

frictional motion.

vibrational motion.

translational motion

The correct answer is A) rotational motion.

A couple consists of two equal and opposite forces acting on a body but not along the same line. This creates a turning effect or torque, causing the body to rotate rather than move linearly (translational motion). Therefore, a couple produces rotational motion.

The correct answer is A) rotational motion.

15 / 16

Which of the following shows work done is against gravity?

1 Boy kicking a ball.

2 Man pulling a table.

3 Girl lifting an object to a certain height.

4 Girl taking out water from a well of 20 m depth.

1 and 2

2 and 3

3 and 4

4 and 1

The correct answer is C) 3 and 4.

3) Girl lifting an object to a certain height: Work is done against gravity when an object is lifted upward because the force applied (to lift the object) opposes the gravitational force pulling the object down.
4) Girl taking out water from a well of 20 m depth: In this case, work is done against gravity while pulling the water upwards out of the well.

In contrast, kicking a ball or pulling a table involves horizontal or lateral motion, not directly opposing gravity.

The correct answer is C) 3 and 4.

3) Girl lifting an object to a certain height: Work is done against gravity when an object is lifted upward because the force applied (to lift the object) opposes the gravitational force pulling the object down.
4) Girl taking out water from a well of 20 m depth: In this case, work is done against gravity while pulling the water upwards out of the well.

In contrast, kicking a ball or pulling a table involves horizontal or lateral motion, not directly opposing gravity.

16 / 16

Big Bang theory is a widely accepted theory regarding the origin and evolution of the universe. Based on the red shift data, most astronomers infer that the universe is currently

expanding

contracting

moving randomly

fixed and stationary

The correct answer is A) expanding.

The Big Bang theory, supported by redshift data, indicates that galaxies are moving away from each other, which implies that the universe is expanding. This redshift is observed in the light coming from distant galaxies, which shifts toward the red end of the spectrum as they move away, consistent with the expansion of the universe.

The correct answer is A) expanding.

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