|
Questions |
Answers |
| 1 |
A simple machine helps a person in doing – |
The same amount of work with lesser force |
| 2 |
A man is standing on a sensitive balance. If he inhales deeply, the reading of the balance – |
Increases |
| 3 |
Which physical quantity is represented by the ratio of momentum and velocity of the body? |
Mass |
| 4 |
Force is the product of – |
Mass and acceleration |
| 5 |
If the number represents volume and surface area of a cube are equal, then the length of the edge of the cube in terms of the unit of measurement will be – |
6 |
| 6 |
Energy conservation means – |
Energy can neither be created nor destroyed |
| 7 |
The energy of wind is – |
Only kinetic |
| 8 |
In wind power, which form of energy is converted into electrical energy? |
Kinetic energy |
| 9 |
Newton’s first law of motion is known as – |
Law of Inertia |
| 10 |
As the train starts moving, the head of the passenger sitting inside leans backward because of – |
Inertia of Rest |
| 11 |
Static science is associated with – |
Situation of rest |
| 12 |
It is more difficult to walk on the ice than on the road because – |
Ice has a lesser friction than the road. |
| 13 |
For every action there is an equal and opposite reaction. The law was given by – |
Newton |
| 14 |
A man jumped at a speed of 5 meters per second from a stationary boat and the boat moved off at the speed of 0.5 meters per second. How many times is the mass of the boat greater than that of the man? |
10 times |
| 15 |
A truck, a car, and a motorcycle have equal kinetic energies. If equal stopping forces are applied and they stop after traveling a distance of X, Y, and Z respectively, then – |
X = Y = Z |
| 16 |
The ratio of kinetic energies of two bodies of the same mass is 4: 9, the ratio of their velocities will be – |
2 – 3 |
| 17 |
Cycles and cars use ball bearings, because – |
The effective area of contact between the wheel and axle is reduced. |
| 18 |
An oil tanker is partially filled with oil and moves forward on a level road with uniform acceleration. The free surface of oil then – |
Is inclined to the horizontal with a larger depth at the rear end |
| 19 |
A batsman hits a cricket ball which then rolls on a level ground. After covering a short distance, the ball comes to rest. The ball slows to a stop because – |
There is a force on the ball opposing the motion |
| 20 |
What is the correct equation for finding the acceleration? |
A = v-u/t |
| 21 |
The working principle of a washing machine is – |
Centrifugation |
| 22 |
The separation of cream from milk by churning is due to – |
Centrifugal force |
