Units & Dimensions
Q. If the length of a side of a cube is doubled, how does its volume change?
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A.
Increases by 2 times
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B.
Increases by 4 times
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C.
Increases by 8 times
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D.
Remains the same
Solution
The volume of a cube is given by V = a³. If the side length a is doubled, the new volume is (2a)³ = 8a³, which is 8 times the original volume.
Correct Answer: C — Increases by 8 times
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Q. If the length of an object is doubled, what happens to its area?
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A.
It remains the same
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B.
It doubles
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C.
It triples
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D.
It quadruples
Solution
If the length is doubled, the area increases by a factor of four (A = length²).
Correct Answer: D — It quadruples
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Q. If the length of an object is doubled, what happens to its volume?
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A.
It remains the same
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B.
It doubles
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C.
It triples
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D.
It increases by a factor of eight
Solution
If the length is doubled, the volume increases by a factor of 2^3 = 8, since volume is proportional to the cube of the length.
Correct Answer: D — It increases by a factor of eight
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Q. The dimensional formula for work is:
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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^1 L^0 T^0]
Solution
The dimensional formula for work is [M^1 L^2 T^-2].
Correct Answer: A — [M^1 L^2 T^-2]
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Q. The unit of electric charge in SI is?
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A.
Coulomb
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B.
Ampere
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C.
Volt
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D.
Ohm
Solution
The SI unit of electric charge is Coulomb (C).
Correct Answer: A — Coulomb
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Q. The unit of energy in the SI system is:
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A.
Joule
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B.
Calorie
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C.
Watt
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D.
Newton
Solution
The SI unit of energy is Joule (J).
Correct Answer: A — Joule
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Q. What are the dimensions of pressure?
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A.
ML^-1T^-2
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B.
ML^2T^-2
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C.
ML^2T^-1
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D.
M^0L^0T^0
Solution
Pressure is defined as force per unit area. The dimensions of force are ML^1T^-2, and area is L^2, thus pressure has dimensions ML^-1T^-2.
Correct Answer: A — ML^-1T^-2
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Q. What is the dimension of electric charge?
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A.
[M^1 L^2 T^-3 I^1]
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B.
[M^0 L^0 T^0 I^1]
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C.
[M^1 L^1 T^-2 I^1]
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D.
[M^0 L^1 T^-1 I^1]
Solution
The dimension of electric charge is [M^1 L^2 T^-3 I^1].
Correct Answer: A — [M^1 L^2 T^-3 I^1]
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Q. What is the dimension of frequency?
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A.
M^0L^0T^-1
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B.
M^1L^0T^-1
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C.
M^0L^1T^-1
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D.
M^0L^0T^0
Solution
Frequency is defined as the number of cycles per unit time, thus its dimension is [M^0L^0T^-1].
Correct Answer: A — M^0L^0T^-1
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Q. What is the dimension of the gravitational constant G?
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A.
M^-1L^3T^-2
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B.
M^1L^3T^-2
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C.
M^1L^2T^-2
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D.
M^0L^0T^0
Solution
The gravitational constant G has dimensions of [M^-1L^3T^-2] as it relates mass, distance, and time in the law of gravitation.
Correct Answer: A — M^-1L^3T^-2
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Q. What is the dimensional formula for acceleration?
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A.
[M^0 L^1 T^-2]
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B.
[M^0 L^0 T^-2]
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C.
[M^1 L^1 T^-2]
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D.
[M^1 L^0 T^-2]
Solution
The dimensional formula for acceleration is [M^0 L^1 T^-2], as it is defined as the change in velocity per unit time.
Correct Answer: A — [M^0 L^1 T^-2]
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Q. What is the dimensional formula for electric charge?
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A.
[M^1 L^2 T^-3 I^-1]
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B.
[M^0 L^0 T^1 I^1]
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C.
[M^0 L^1 T^-2 I^1]
-
D.
[M^1 L^1 T^-2 I^-1]
Solution
The dimensional formula for electric charge is [M^1 L^2 T^-3 I^-1], derived from the definition of current (I = Q/t).
Correct Answer: A — [M^1 L^2 T^-3 I^-1]
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Q. What is the dimensional formula for frequency?
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A.
[M^0 L^0 T^-1]
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B.
[M^1 L^0 T^-1]
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C.
[M^0 L^1 T^0]
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D.
[M^0 L^0 T^1]
Solution
The dimensional formula for frequency is [M^0 L^0 T^-1], as it is defined as the number of cycles per unit time.
Correct Answer: A — [M^0 L^0 T^-1]
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Q. What is the dimensional formula for velocity?
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A.
MLT⁻¹
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B.
ML²T⁻²
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C.
M⁰L⁰T⁻¹
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D.
M⁰L¹T⁻²
Solution
Velocity is defined as displacement per unit time, which gives the dimensional formula of [MLT⁻¹].
Correct Answer: A — MLT⁻¹
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Q. What is the dimensional formula for work?
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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^-2]
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D.
[M^1 L^0 T^-2]
Solution
Work has the dimensional formula [M^1 L^2 T^-2].
Correct Answer: A — [M^1 L^2 T^-2]
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Q. What is the relationship between Joules and Newton-meters?
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A.
They are equal
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B.
Joule is greater
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C.
Newton-meter is greater
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D.
They are unrelated
Solution
1 Joule is defined as 1 Newton-meter, so they are equal.
Correct Answer: A — They are equal
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Q. What is the relationship between mass and weight?
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A.
Weight = Mass × Acceleration due to gravity
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B.
Weight = Mass / Acceleration due to gravity
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C.
Weight = Mass + Acceleration due to gravity
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D.
Weight = Mass - Acceleration due to gravity
Solution
Weight is defined as the force due to gravity acting on a mass, given by the formula Weight = Mass × g (where g is the acceleration due to gravity).
Correct Answer: A — Weight = Mass × Acceleration due to gravity
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Q. What is the relationship between the units of energy and work?
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A.
They are the same
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B.
Energy is greater than work
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C.
Work is greater than energy
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D.
They are different
Solution
Energy and work are measured in the same unit, which is Joules (J).
Correct Answer: A — They are the same
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Q. What is the relationship between the units of work and energy?
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A.
They are the same
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B.
Work is a subset of energy
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C.
Energy is a subset of work
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D.
They are unrelated
Solution
Work and energy are measured in the same unit, which is Joules (J) in the SI system.
Correct Answer: A — They are the same
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Q. What is the unit of pressure in the SI system?
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A.
Pascal
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B.
Bar
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C.
Torr
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D.
Atmosphere
Solution
The SI unit of pressure is Pascal (Pa), defined as one newton per square meter (N/m²).
Correct Answer: A — Pascal
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Q. Which of the following is a unit of energy?
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A.
Joule
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B.
Newton
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C.
Watt
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D.
Pascal
Solution
Joule is the unit of energy in the SI system, defined as the work done when a force of one newton displaces an object by one meter.
Correct Answer: A — Joule
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Q. Which of the following is NOT a base unit in the SI system?
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A.
Meter
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B.
Kilogram
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C.
Second
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D.
Liter
Solution
Liter is not a base unit; it is a derived unit for volume, while meter, kilogram, and second are base units.
Correct Answer: D — Liter
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Q. Which of the following is not a fundamental unit?
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A.
Meter
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B.
Kilogram
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C.
Second
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D.
Joule
Solution
Joule is not a fundamental unit; it is a derived unit.
Correct Answer: D — Joule
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Q. Which of the following is the correct dimensional formula for electric charge?
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A.
[M^1 L^2 T^-3 A^-1]
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B.
[M^0 L^0 T^0 A^1]
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C.
[M^0 L^1 T^-2 A^1]
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D.
[M^1 L^1 T^-2 A^-1]
Solution
The dimensional formula for electric charge is [M^1 L^2 T^-3 A^-1], derived from the definition of current.
Correct Answer: A — [M^1 L^2 T^-3 A^-1]
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Q. Which of the following is the correct unit for measuring electric charge?
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A.
Coulomb
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B.
Ampere
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C.
Volt
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D.
Ohm
Solution
The SI unit for electric charge is Coulomb (C).
Correct Answer: A — Coulomb
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Q. Which of the following is the correct unit for measuring energy?
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A.
Joule
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B.
Newton
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C.
Watt
-
D.
Pascal
Solution
The correct unit for measuring energy is Joule (J).
Correct Answer: A — Joule
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Q. Which of the following quantities has the dimension of energy?
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A.
Force
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B.
Work
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C.
Power
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D.
Pressure
Solution
Work is defined as force times distance, and its dimensions are ML^2T^-2, which are the same as energy.
Correct Answer: B — Work
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Q. Which of the following quantities has the dimension of [M^0 L^0 T^-1]?
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A.
Velocity
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B.
Acceleration
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C.
Frequency
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D.
Force
Solution
Frequency has the dimension of [M^0 L^0 T^-1] as it is defined as the number of cycles per unit time.
Correct Answer: C — Frequency
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Q. Which of the following quantities has the dimension of [M^0 L^0 T^0]?
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A.
Mass
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B.
Time
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C.
Length
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D.
Angle
Solution
Angle is a dimensionless quantity and has the dimension of [M^0 L^0 T^0].
Correct Answer: D — Angle
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Q. Which of the following quantities has the dimension of [M^0 L^1 T^-1]?
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A.
Velocity
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B.
Acceleration
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C.
Force
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D.
Pressure
Solution
Velocity has the dimension of [M^0 L^1 T^-1], as it is defined as distance per unit time.
Correct Answer: A — Velocity
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