A stone is thrown vertically upward with velocity 49 m/s. The time after which it returns to thrower is (g=9.8) MCQ with Answer and Explanation

A stone is thrown vertically upward with velocity 49 m/s. The time after which it returns to thrower is (g=9.8)
A. 5 s
B. 15 s
C. 2.5 s
D. 10 s
Answer: Option D
Solution (By JKSSB Mock Tests)
Time of flight T = 2u/g = 2×49/9.8 = 98/9.8 = 10 s. Up and down symmetric. Max height = u²/(2g) = 122.5 m.

Discuss this Question (0)

No comments yet. Be the first to start the discussion!

Practice More Physics Questions

Question #1
The sound produced by a bat is
A. Ultrasonic
B. Infrasonic
C. Subsonic
D. Audible

Correct Answer: Option A


Explanation:
Bats use ultrasound for echolocation.

This question belongs to: Science Physics
Question #2
What happens to the atomic number and mass number of a radioactive nucleus when it emits a gamma ray?
A. Both atomic number and mass number remain completely unchanged.
B. Atomic number increases by 1, mass number remains the same.
C. Both atomic number and mass number decrease by 1.
D. Atomic number decreases by 2, mass number decreases by 4.

Correct Answer: Option A


Explanation:
Gamma emission is the release of high-energy electromagnetic radiation (photons) from a nucleus transitioning from an excited high-energy state to a lower, stable energy state. Gamma rays carry no mass and no electrical charge. Therefore, the emission of a gamma ray does not alter the number of protons (atomic number) or the total number of nucleons (mass number) of the atom.

This question belongs to: Science Physics
Question #3
Which of the following is an example of a third class lever?
A. Fishing rod
B. Scissors
C. Crowbar
D. Seesaw

Correct Answer: Option A


Explanation:
In third class lever, effort between fulcrum and load. Fishing rod, tweezers, forearm. Scissors first class, crowbar first/second, seesaw first. Mechanical advantage

This question belongs to: Science Physics