A body of mass M hits normally a rigid wall with velocity V and bounces back with the same velocity. The impulse experienced by the body is
A car is moving on a road and rain is falling vertically. Select the correct answer
If the earth is 1/4th of its present distance from the sun, the duration of the year would be
If the radius of the earth were to shrink by 1% its mass remaining the same, the acceleration due to gravity on the earth’s surface would
The maximum current that can be measured.by a galvenometer of resistance 400 is 10 mA. It is converted into a voltmeter that can read upto 50 V. The resistance to be connected in series with the galvanometer is (in ohm).
In which of the following industries is mica as a raw material?
The earth’s gravitational pull is just balanced by the centripetal force resulting into?
Which instrument is used to record physical happenings at a distant place ?
Kicked or thrown balls, jumping animals, object thrown from a window, a missile shot from a gun, a bomb released from a bomber plane, etc are all example of?
On a cold day when a room temperature is 15oC, the metallic cap of a pen becomes much colder than its plastic body, though both are at the same temperature of 15oC, because
The range of the projectile depends on the square of the initial velocity and?
If the value of gravitational acceleration at a height h above the Earth’s surface is the same as that at a depth d below the Earth’s surface (with both h and d small compared to the Earth’s radius R), then
Out of the following pairs, which one does not have identical dimension?
what Newton made the hypothesis?
The force which opposes the relative motion between different layers of liquid or gases is called
Which of the following is a dichroic crystal?
Chemical energy is converted into electrical energy, is case of?
Siphon will fail to work if
The Universal law of gravitation must apply to?
The absorption of ink by blotting paper involves
Consider the following statements:
A body weighs less at the equator than at the poles because:
1. earth rotates about its axis.
2. the ice cap at the poles increases gravitational pull.
3. equatorial diameter is greater than the polar diameter.
4. of some unknown facts.
Which of the statements given above is/are incorrect?
Radiocarbon is produced in the atmosphere as a result of
Sound produced at a point is heard by a person after 5 second, while the same sound is heard by another person after 6 seconds. If the speed of sound is 300 m/s, what could be the maximum and minimum distances between the two persons?
Ultrasonic waves are used for stirring liquid solutions because they
A material has Poisson's ratio 0.50. If a uniform rod of it suffers a longitudinal strain of 2 × 10–3, then the percentage change in volume is
What is the relation between wavelength, frequency and velocity ?
Consider the following statements :
(1) For a spherically symmetric earth, the acceleration due to gravity should be about the same at the equator and at the poles.
(2) If earth suddenly stops rotating about its axis, then the value of g will be same at all the places.
Which of these statement(s) is/are correct ?
A perfect gas at 27°C is heated at constant pressure so as to double its volume. The increase in temperature of the gas will be ______.