MEDIUM
RRB Group D CBT
IMPORTANT
Earn 100

Variations in the length of day time and night time from season to season are due to_____.

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Important Questions on Mechanics

EASY
RRB Group D CBT
IMPORTANT
General Science>Chapter 1 - Mechanics>Self Check>Q 2
The known forces of nature can be divided into four classes, viz, gravity, electromagnetism, weak nuclear force, and strong nuclear force. With reference to them, which one of the following statements is not correct?
MEDIUM
RRB Group D CBT
IMPORTANT
General Science>Chapter 1 - Mechanics>Self Check>Q 3
Ball bearings are used in bicycles, cars, etc., because _____.
MEDIUM
RRB Group D CBT
IMPORTANT
General Science>Chapter 1 - Mechanics>Self Check>Q 4

Satellites used for telecommunication relay are kept in a geostationary orbit. A satellite is said to be in such an orbit when:

1. The orbit is geosynchronous

2. The orbit is circular

3. The orbit lies in the place of the earth's equator

4. The orbit is at an altitude of 22236 km

Which of the statement(s) given above is/are correct?

HARD
RRB Group D CBT
IMPORTANT
General Science>Chapter 1 - Mechanics>Self Check>Q 5

Consider the following statements in respect of a jet engine and a rocket:

1. A jet engine uses the surrounding air for its oxygen supply and so is unsuitable for motion in space.

2. A rocket carries its own supply of oxygen in the gas form and fuel.

Which of the statement(s) given above is/are correct?

MEDIUM
RRB Group D CBT
IMPORTANT
General Science>Chapter 1 - Mechanics>Self Check>Q 6

Consider the following statements:

1. Geostationary satellites are used to reflect TV signals and telecast TV program from one part of the world to another.

2. Polar satellites are used for weather forecasting.

Which of the statement(s) given above is/are correct?

MEDIUM
RRB Group D CBT
IMPORTANT
General Science>Chapter 1 - Mechanics>Self Check>Q 7

Consider the following statements:

Statement I: When a parachutist jumps from a height, a graph relating displacement and time will be parabolic.

Statement ll: Velocity-time graph of a particle freely falling under gravity is a straight line.

Which of the statement(s) given above is/are correct?

HARD
RRB Group D CBT
IMPORTANT
General Science>Chapter 1 - Mechanics>Self Check>Q 8

Consider the following statements:

Statement I: If a gymnast standing on a rotating stool with his arms stretched suddenly lowers his arms. His angular velocity increases.

Statement II: A geostationary satellite is at an approximate height of 10000 km.

Which of the above statement(s) is/are correct?

EASY
RRB Group D CBT
IMPORTANT
General Science>Chapter 1 - Mechanics>Self Check>Q 9

Consider the following statements:

1. A force is said to be conservative if the work done by the force on a particle in a round trip is zero.

2. A force is said to be non-conservative if work done by the force on a particle in a round trip is not zero.

3. The gravitational force and the electrostatic force are examples of non-conservative forces.

4. Viscous force and frictional force are examples of conservative forces.

Which of the statement (s) given above is/are correct?