Physics - Study Mode

[#931] Two stones of unequal masses are thrown vertically up with the same velocity. Which of the following will happen?
Correct Answer

(C) Both will reach the same height

Explanation

Solution: Galileo’s experiment showed that if two bodies of unequal masses are dropped from the same height, the time required by them to reach the ground are equal. If they are thrown vertically upwards with the same initial velocity, then the ratio of the time required to reach the ground is equal to unity. This means that both of them will reach the same height.

[#932] The dimension of which of the following is the same as that of impulse ?
Correct Answer

(B) Momentum

Explanation

Solution: Impulse has the same units and dimensions (MLT -1 ) as momentum.

[#933] An object covers distance which is directly proportional to the square of the time. Its accelaration is
Correct Answer

(D) Constant

Explanation

Solution: If an object covers distance in direct proportion to the square of the time elapsed, then the acceleration is constant.

[#934] A bullet of mass 10gm is fired with a velocity of 40 m/s from a gun of mass 8 kg. Find the recoil velocity (in m/s) of the gun.
Correct Answer

(D) 0.05

[#935] Which one type of radiation has the longest wave length
Correct Answer

(D) Radio Wave

Explanation

Solution: The waves in the electromagnetic spectrum that have the longest wavelengths and lowest frequency are called radio waves.