few Physics questions of class 9th for exams
Answers
Answered by
2
1)The minute hand of a clock is 7 cm long. Find the displacement and the distance covered by it from 9 a.m. to 9:30 a.m. .
2) List three possible effects that can be produced by force. A boy throws a ball upwards with a speed 10 m/sec. The mass of ball is 400g. Calculate:
¡) Weight of the ball.
¡¡) Initial momentum of the ball.
3) Two block piece of same mass and same size are dipped in water and oil. One blocks floats in water and the other sink in oil. Explain why?? When you mix oil and water, explain what will be the top layer of the mixture?
4) Define by drawing the graphs to show the following:
a) Uniform acceleration.
b) Non uniform acceleration.
c) Uniform motion.
5) Define momentum of a body.
6) Prove with the help of 3rd law of motion that the total momentum of two bodies is conserved during collision provided no external force acts.
7) Car A of mass 1500 kg travelling at 25 m/s collides with another car B of mass 1000 kg travelling at 15 m/s in the same direction. After collision, the velocity of car A becomes 20m/s. Calculate the velocity of car B after collision.
8) Explain the working of human ear with diagram.
9) States archimedes principle. State laws of floatation. Explain why iron nail sinks but iron boats floats. Why is it easier to swim in sea water than in river water??
10) What happens to the speed of sound it the medium is changed?
2) List three possible effects that can be produced by force. A boy throws a ball upwards with a speed 10 m/sec. The mass of ball is 400g. Calculate:
¡) Weight of the ball.
¡¡) Initial momentum of the ball.
3) Two block piece of same mass and same size are dipped in water and oil. One blocks floats in water and the other sink in oil. Explain why?? When you mix oil and water, explain what will be the top layer of the mixture?
4) Define by drawing the graphs to show the following:
a) Uniform acceleration.
b) Non uniform acceleration.
c) Uniform motion.
5) Define momentum of a body.
6) Prove with the help of 3rd law of motion that the total momentum of two bodies is conserved during collision provided no external force acts.
7) Car A of mass 1500 kg travelling at 25 m/s collides with another car B of mass 1000 kg travelling at 15 m/s in the same direction. After collision, the velocity of car A becomes 20m/s. Calculate the velocity of car B after collision.
8) Explain the working of human ear with diagram.
9) States archimedes principle. State laws of floatation. Explain why iron nail sinks but iron boats floats. Why is it easier to swim in sea water than in river water??
10) What happens to the speed of sound it the medium is changed?
Anaiza:
nhi mere khyal se tm bhul gye ho
kaise karun abhi exams chl rha h Iske bad karungi
exams kw
bad please
srry srry s
tum sahi me bulgaye
Similar questions