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The SI unit of frequency is:
A. Hertz
B. Joule
C. Watt
D. Pascal
Answer: Hertz
The concept of ‘thermal equilibrium’ is described by which law of thermodynamics?
A. Zeroth law of thermodynamics
B. First law of thermodynamics
C. Second law of thermodynamics
D. Third law of thermodynamics
Answer: Zeroth law of thermodynamics
The resistance of a material to deformation under shear stress is referred to as:
A. Shear modulus
B. Bulk modulus
C. Young's modulus
D. Poisson's ratio
Answer: Shear modulus
The gravitational force between two objects is given by which of the following formulas?
A. F = G(m₁m₂)/r²
B. F = G(m₁m₂)/r
C. F = Gm₁m₂r²
D. F = Gm₁m₂/r
Answer: F = G(m₁m₂)/r²
In an elastic collision, which of the following is conserved?
A. Kinetic energy and momentum
B. Momentum only
C. Kinetic energy only
D. Potential energy and momentum
Answer: Kinetic energy and momentum
The power of a machine that performs 1500 J of work in 30 seconds is:
A. 50 W
B. 100 W
C. 75 W
D. 25 W
Answer: 50 W
In dynamics, the term ‘friction’ refers to:
A. The resistance to motion between two surfaces in contact
B. The force that propels an object forward
C. The force that acts in the direction of motion
D. The force exerted by a fluid
Answer: The resistance to motion between two surfaces in contact
The force that causes an object to follow a curved path is called:
A. Centripetal force
B. Centrifugal force
C. Gravitational force
D. Frictional force
Answer: Centripetal force
The impulse-momentum theorem states that the impulse on an object is equal to its:
A. Change in momentum
B. Change in kinetic energy
C. Change in potential energy
D. Work done
Answer: Change in momentum