|
Prove that if a body is thrown vertically upward, the time of ascent is equal to the time of descent
|
|
0
|
5866
|
March 21, 2018
|
|
Give reasons for the following: The reverberation time of a hall used for speeches should be very short
|
|
0
|
2920
|
March 21, 2018
|
|
Calculate the average density of the earth in terms of g, G and R
|
|
0
|
4777
|
March 21, 2018
|
|
On the earth, a stone is thrown from a height in a direction parallel to the earth’s surface while another stone is simultaneously dropped from the same height. Which stone would reach the ground first and why?
|
|
0
|
7825
|
March 21, 2018
|
|
State an approximate value for the speed of sound in air
|
|
0
|
1799
|
March 21, 2018
|
|
Give three differences between acceleration due to gravity (g) and universal gravitational constant (G)
|
|
0
|
14846
|
March 21, 2018
|
|
Prove that if the earth attracts two bodies placed at same distance from the centre of the earth with the same force, then their masses are equal
|
|
0
|
25490
|
March 21, 2018
|
|
Suppose that the radius of the earth becomes twice of its original radius without any change in its mass. Then what will happen to your weight?
|
|
0
|
17454
|
March 21, 2018
|
|
A girl is sitting in the middle of a park of dimension 12 m X 12 m
|
|
0
|
5042
|
March 21, 2018
|
|
What is the source of centripetal force that a planet requires to revolve around the sun? On what factors does that force depend?
|
|
0
|
852
|
March 21, 2018
|
|
Why does a body reach the ground quicker at poles than at the equator when dropped from the same height?Why does a body reach the ground quicker at poles than at the equator when dropped from the same height?
|
|
0
|
10118
|
March 21, 2018
|
|
When does an object show weightlessness?
|
|
0
|
5207
|
March 21, 2018
|
|
In the graphs given below representing the human voice, which of the two graphs or is likely to be the male voice? Give reason for your answer
|
|
0
|
3192
|
March 21, 2018
|
|
Mention any four phenomena that the universal law of gravitation was able to explain
|
|
0
|
12457
|
March 21, 2018
|
|
What is a sound board?
|
|
0
|
4157
|
March 21, 2018
|
|
The earth attracts an apple. Does the apple also attract the earth? If it does, why does the earth not move towards the apple?
|
|
0
|
2777
|
March 21, 2018
|
|
Write full form of acronym SONAR. Explain how the method of echo- ranging is used to determine the depth of sea
|
|
0
|
3045
|
March 21, 2018
|
|
Draw diagrams to represent soft sound and loud sound
|
|
0
|
2643
|
March 21, 2018
|
|
Describe Newton’s third law of motion
|
|
0
|
1352
|
March 21, 2018
|
|
. Plot the following: A longitudinal wave in air on a density-distance graph. A transverse wave on a displacement-distance graph
|
|
0
|
4491
|
March 21, 2018
|
|
What is the relationship between mass and inertia? Explain with the help of examples
|
|
0
|
23040
|
March 21, 2018
|
|
Derive the mathematical formula of conservation of momentum
|
|
0
|
12109
|
March 21, 2018
|
|
Which wave characteristics determine the loudness pitch of sound?
|
|
0
|
2101
|
March 21, 2018
|
|
Derive the mathematical relation of Newton’s second law of motion
|
|
0
|
31398
|
March 21, 2018
|
|
Describe Newton’s first law of motion in detail, giving examples
|
|
0
|
887
|
March 21, 2018
|
|
Why do the driver and the person seated in front seat need a seat belt?
|
|
0
|
6164
|
March 21, 2018
|
|
Describe balanced forces with the help of two examples
|
|
0
|
3994
|
March 21, 2018
|
|
Prove that u=vλ, where the symbols have their usual meanings
|
|
0
|
6667
|
March 21, 2018
|
|
Why does an athlete puts some sands or cushion on the ground while high jumping?
|
|
0
|
9252
|
March 21, 2018
|
|
Two friends on roller-skates are standing 5 m apart facing each other. One of them throws a ball of 2 kg towards the other, who catches it
|
|
0
|
10770
|
March 21, 2018
|