1. What is the SI unit of torque acting on an electric dipole?
A.
Newton
B.
Newton metre
C.
Coulomb metre
D.
Joule per coulomb
Correct Answer:
Newton metre
Explanation:
Torque is measured in newton metre (N m) in the SI system.
2. The SI unit N m represents which physical quantity in the context of an electric dipole?
A.
Electric charge
B.
Electric field
C.
Torque
D.
Electric potential
Correct Answer:
Torque
Explanation:
The product of force in newtons and perpendicular distance in metres gives torque in newton metres.
3. Which of the following is equivalent to the SI unit of torque?
A.
kg m s⁻²
B.
kg m² s⁻²
C.
kg m⁻¹ s⁻²
D.
kg m² s⁻¹
Correct Answer:
kg m² s⁻²
Explanation:
Since 1 N = 1 kg m s⁻², 1 N m = 1 kg m² s⁻².
4. The torque on an electric dipole is expressed in which SI unit?
A.
N/C
B.
C m
C.
N m
D.
V/m
Correct Answer:
N m
Explanation:
Torque is the turning effect of a force and its SI unit is newton metre (N m).
5. One newton metre of torque is equal in dimensions to which unit?
A.
One joule
B.
One watt
C.
One coulomb
D.
One volt
Correct Answer:
One joule
Explanation:
A newton metre has the same dimensions as a joule, although torque and energy are different physical quantities.
6. If the torque on an electric dipole is written as 5 N m, what does N m denote?
A.
The SI unit of dipole moment
B.
The SI unit of electric field
C.
The SI unit of torque
D.
The SI unit of charge
Correct Answer:
The SI unit of torque
Explanation:
N m stands for newton metre, which is the SI unit used for torque.
7. Which combination of SI base units gives the unit of torque?
A.
kg m s⁻¹
B.
kg m² s⁻²
C.
kg m⁻² s⁻²
D.
kg m² s⁻¹
Correct Answer:
kg m² s⁻²
Explanation:
Torque has unit force times distance: (kg m s⁻²) × m = kg m² s⁻².
8. A torque of 2 N m can also be written as:
A.
2 kg m² s⁻²
B.
2 kg m s⁻¹
C.
2 kg m⁻¹ s⁻²
D.
2 kg m² s⁻¹
Correct Answer:
2 kg m² s⁻²
Explanation:
Because 1 N m equals 1 kg m² s⁻², 2 N m equals 2 kg m² s⁻².
9. Which unit should be used to report the torque produced on a dipole in an electric field?
A.
Coulomb
B.
Newton metre
C.
Volt per metre
D.
Coulomb metre
Correct Answer:
Newton metre
Explanation:
The SI unit for the turning effect, or torque, on a dipole is newton metre.
10. The SI unit of torque is formed by multiplying which two SI units?
A.
Newton and metre
B.
Coulomb and metre
C.
Volt and coulomb
D.
Newton and coulomb
Correct Answer:
Newton and metre
Explanation:
Torque equals force multiplied by perpendicular distance, so its unit is newton multiplied by metre, or N m.
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