Q. What is the work done when a force of 10 N moves an object 5 m in the direction of the force? (2016)
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A.
50 J
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B.
25 J
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C.
10 J
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D.
5 J
Solution
Work done (W) = Force × Distance = 10 N × 5 m = 50 J.
Correct Answer: A — 50 J
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Q. What is the work done when a force of 15 N moves an object 3 m at an angle of 0 degrees to the direction of motion?
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A.
45 J
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B.
30 J
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C.
60 J
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D.
75 J
Solution
Work = Force * Distance * cos(θ) = 15 N * 3 m * cos(0°) = 45 J.
Correct Answer: A — 45 J
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Q. What is the work done when a force of 15 N moves an object 4 m in the direction of the force?
-
A.
60 J
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B.
30 J
-
C.
45 J
-
D.
75 J
Solution
Work done = Force × Distance = 15 N × 4 m = 60 J
Correct Answer: A — 60 J
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Q. Which law relates the magnetic field around a conductor to the current flowing through it? (2023)
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A.
Faraday's Law
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B.
Ampere's Law
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C.
Ohm's Law
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D.
Lenz's Law
Solution
Ampere's Law relates the magnetic field around a conductor to the current flowing through it.
Correct Answer: B — Ampere's Law
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Q. Which law states that the total momentum of a closed system remains constant?
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A.
Newton's First Law
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B.
Newton's Second Law
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C.
Conservation of Momentum
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D.
Conservation of Energy
Solution
The Conservation of Momentum states that in a closed system, the total momentum remains constant if no external forces act on it.
Correct Answer: C — Conservation of Momentum
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Q. Which of the following correctly describes the relationship between gravitational force and distance?
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A.
Directly proportional
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B.
Inversely proportional
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C.
Exponential
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D.
Linear
Solution
Gravitational force is inversely proportional to the square of the distance between the centers of two masses.
Correct Answer: B — Inversely proportional
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Q. Which of the following is a base quantity? (2020)
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A.
Force
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B.
Energy
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C.
Length
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D.
Pressure
Solution
Length is a base quantity in the SI system, while force, energy, and pressure are derived quantities.
Correct Answer: C — Length
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Q. Which of the following is a base unit in the SI system? (2020)
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A.
Liter
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B.
Meter
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C.
Newton
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D.
Joule
Solution
Meter is a base unit in the SI system, while liter, newton, and joule are derived units.
Correct Answer: B — Meter
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Q. Which of the following is the correct dimensional formula for acceleration? (2022)
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A.
[M^0 L^1 T^-2]
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B.
[M^1 L^0 T^-2]
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C.
[M^1 L^1 T^-1]
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D.
[M^0 L^0 T^-2]
Solution
Acceleration is defined as the change in velocity per unit time, so its dimensional formula is [M^0 L^1 T^-2].
Correct Answer: A — [M^0 L^1 T^-2]
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Q. Which of the following is the correct dimensional formula for energy? (2023)
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A.
[M^1 L^2 T^-2]
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B.
[M^1 L^1 T^-1]
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C.
[M^0 L^2 T^-1]
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D.
[M^2 L^1 T^-2]
Solution
Energy has the dimensional formula [M^1 L^2 T^-2], as it is defined as work done, which is force times distance.
Correct Answer: A — [M^1 L^2 T^-2]
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Q. Which of the following is the correct dimensional formula for frequency? (2021)
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A.
[M^0 L^0 T^-1]
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B.
[M^0 L^1 T^-1]
-
C.
[M^1 L^0 T^-1]
-
D.
[M^0 L^0 T^1]
Solution
Frequency has the dimensional formula [M^0 L^0 T^-1].
Correct Answer: A — [M^0 L^0 T^-1]
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Q. Which of the following is the unit of pressure? (2023)
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A.
Newton
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B.
Pascal
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C.
Joule
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D.
Watt
Solution
The unit of pressure is Pascal (Pa), which is equivalent to N/m².
Correct Answer: B — Pascal
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Q. Which of the following is true about the law of conservation of energy?
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A.
Energy can be created
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B.
Energy can be destroyed
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C.
Energy can be transformed
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D.
Energy is always lost
Solution
The law of conservation of energy states that energy cannot be created or destroyed, but it can be transformed from one form to another.
Correct Answer: C — Energy can be transformed
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Q. Which of the following materials is a ferromagnetic material? (2020)
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A.
Copper
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B.
Aluminum
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C.
Iron
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D.
Gold
Solution
Iron is a ferromagnetic material, which means it can be magnetized and has a high magnetic permeability.
Correct Answer: C — Iron
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Q. Which of the following materials is considered ferromagnetic? (2022)
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A.
Copper
-
B.
Aluminum
-
C.
Iron
-
D.
Gold
Solution
Iron is considered a ferromagnetic material, which can be magnetized and retains its magnetism.
Correct Answer: C — Iron
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Q. Which of the following quantities has no dimensions? (2019)
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A.
Force
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B.
Energy
-
C.
Angle
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D.
Pressure
Solution
Angle is a pure number and has no dimensions, while force, energy, and pressure all have dimensions.
Correct Answer: C — Angle
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Q. Which of the following quantities is not a scalar? (2021)
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A.
Mass
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B.
Temperature
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C.
Velocity
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D.
Speed
Solution
Velocity is a vector quantity as it has both magnitude and direction, while mass, temperature, and speed are scalar quantities.
Correct Answer: C — Velocity
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Q. Which of the following statements about thermal conductivity is true? (2021)
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A.
It is higher in gases than in solids
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B.
It is a measure of a material's ability to conduct heat
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C.
It increases with temperature
-
D.
It is independent of material type
Solution
Thermal conductivity is a measure of a material's ability to conduct heat; it varies with material type.
Correct Answer: B — It is a measure of a material's ability to conduct heat
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Q. Which of the following statements is true about the image formed by a convex lens? (2021)
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A.
Always real
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B.
Always virtual
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C.
Can be real or virtual
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D.
Always inverted
Solution
A convex lens can form both real and virtual images depending on the position of the object relative to the focal point.
Correct Answer: C — Can be real or virtual
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Q. Which of the following statements is true about the law of conservation of energy?
-
A.
Energy can be created
-
B.
Energy can be destroyed
-
C.
Energy can be transformed
-
D.
Energy is always lost
Solution
The law of conservation of energy states that energy cannot be created or destroyed, but it can be transformed from one form to another.
Correct Answer: C — Energy can be transformed
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Q. Which of the following statements is true about the nucleus of an atom? (2019)
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A.
It contains only protons
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B.
It contains only neutrons
-
C.
It contains protons and neutrons
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D.
It contains electrons
Solution
The nucleus of an atom contains protons and neutrons, which are collectively known as nucleons.
Correct Answer: C — It contains protons and neutrons
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Q. Which of the following statements is true regarding gravitational fields? (2022)
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A.
Gravitational fields are always attractive
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B.
Gravitational fields can be repulsive
-
C.
Gravitational fields are independent of mass
-
D.
Gravitational fields do not exist in space
Solution
Gravitational fields are always attractive, pulling masses towards each other.
Correct Answer: A — Gravitational fields are always attractive
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Q. Which of the following statements is true regarding the uncertainty principle? (2023)
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A.
It applies only to macroscopic objects
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B.
It states that position and momentum cannot be known simultaneously
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C.
It is only applicable in classical mechanics
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D.
It has no practical implications
Solution
The uncertainty principle states that position and momentum cannot be precisely known at the same time.
Correct Answer: B — It states that position and momentum cannot be known simultaneously
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Q. Which of the following statements is true regarding thermal conductivity? (2023)
-
A.
It is higher in gases than in solids
-
B.
It is a measure of a material's ability to conduct heat
-
C.
It increases with temperature
-
D.
It is independent of material properties
Solution
Thermal conductivity is a measure of a material's ability to conduct heat; it varies with material and temperature.
Correct Answer: B — It is a measure of a material's ability to conduct heat
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