Physics - Study Mode

[#266] A particle is thrown vertically upward. When it reaches the highest point, it has
Correct Answer

(A) A downward acceleration

Explanation

Solution: When a particle is thrown vertically upwards in space, it will experience constant acceleration towards the ground (irrespective of the direction in which it is moving in), known as acceleration due to gravity. At the highest point, it has zero velocity but has downward acceleration equal to acceleration due to gravity.

[#267] The quantity that is not conserved in an inelastic collision is
Correct Answer

(B) Kinetic Energy

Explanation

Solution: Momentum is conserved in all types of collision whether it is elastic or inelastic where as kinetic energy is lost in sound energy in the absence of external force in inelastic collision.

[#268] The dimension MLT –2 corresponds to
Correct Answer

(A) Force

Explanation

Solution: The dimensions of Force are M (mass), L (length) and T -2 (time). It can also be expressed as [newton] = [kilogram] [metre] [second] -2 .

[#269] If lift is going up with acceleration, the apparent weight of a body is
Correct Answer

(B) More than the true weight

Explanation

Solution: If lift is going up with acceleration, the apparent weight of a body is more than the true weight.

[#270] The force that generates wind is
Correct Answer

(B) Pressure gradient force

Explanation

Solution: The force that generates wind is pressure gradient force.