In the SI system, what are the fundamental units of momentum? MCQ with Answer and Explanation

In the SI system, what are the fundamental units of momentum?
A. kg m s⁻¹
B. kg m² s⁻¹
C. kg m s⁻²
D. kg² m s⁻¹
Answer: Option A
Solution (By JKExamLibrary)
Momentum (p) is defined as the product of mass (m) and velocity (v). p = m × v. The SI unit of mass is the kilogram (kg) and the SI unit of velocity is meters per second (m/s or m s⁻¹). Therefore, the SI unit of momentum is kg m/s or kg m s⁻¹.

This question belongs to: Science Physics

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Question #1 Report Error
Which instrument measures the speed of rotation of a shaft?
A. Speedometer
B. Anemometer
C. Odometer
D. Tachometer

Correct Answer: Option D


Explanation:
Tachometer measures rotational speed (RPM). Speedometer vehicle speed. Odometer distance.

This question belongs to: Science Physics
Question #2 Report Error
The concept of 'Inertia' was first practically developed by which scientist before Newton incorporated it into his First Law?
A. Galileo Galilei
B. Aristotle
C. Johannes Kepler
D. Archimedes

Correct Answer: Option A


Explanation:
Galileo Galilei conducted experiments rolling balls down inclined planes and concluded that an object in motion would continue moving indefinitely on a frictionless surface. This completely challenged Aristotelian mechanics and formulated the concept of inertia, which Isaac Newton later formalized as his First Law of Motion.

This question belongs to: Science Physics
Question #3 Report Error
The relation V = IR is applicable to
A. Semiconductors
B. Ohmic conductors
C. Non-ohmic devices
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Correct Answer: Option B


Explanation:
Ohm's law V=IR is linear relationship, valid for ohmic materials like metals at constant temperature. Non-ohmic do not follow linear I-V. Semiconductors are non-ohmic.

This question belongs to: Science Physics