Which law helps to predict the path of the astronomical bodies?
- ANewton’s law of motion
- BNewton’s law of cooling
- ✓Newton’s law of gravitation
- DPascal’s law
Answer: C.
View full solution →Question types
Laws of Motion question types
228 questions across 8 question groups — pick any mix to generate a Science paper with step-by-step answer keys.
228
Questions
8
Question groups
5
Question types
01
Choose the most appropriate answer from the given alternatives and write the option code and the corresponding answer.
85 Q→02Fill in the blank
24 Q→03True-False
16 Q→04Assertion & Reason
10 Q→05[1 Mark Questions]
68 Q→06[2 Mark Questions]
14 Q→07[4 Mark Questions]
7 Q→08Match The Following.
4 Q→Sample Questions
Laws of Motion questions
One sample from each question group in this chapter. Select any group above to see the full set with answer keys.
When an elevator is moving downward, the apparent weight of a person who is in that elevator is:
- Amaximum
- ✓minimum
- Czero
- Dinfinity
Answer: B.
View full solution →When the lift is moving upward with an acceleration ‘o’ the apparent weight of the body is:
- Alesser than actual weight
- Bequal to actual weight
- ✓greater than actual weight
- Dzero
Answer: C.
View full solution →In a lift, apparent weight of a body is equal to zero when the lift is;
- Aat rest
- Bmoving downwards
- Cmoving upwards
- ✓falling down freely
Answer: D.
View full solution →When an elevator is at rest:
- AApparent weight is greater than the actual weight
- ✓Apparent weight is equal to the actual weight
- CApparent weight is less than the actual weight
- DNone of the above
Answer: B.
View full solution →The relation between g and G is ………
The value of gravitational constant is ……… at all places but the value of acceleration due to gravity ………..
The value of g varies with ……… and ………
The force of attraction between two objects is directly proportional to the product of their ……. and inversely proportional to the square of the ………. between them.
1 kg f = ………
. In a ‘free fall’ motion acceleration of the body is equal to the acceleration due to gravity.
The value of acceleration due to gravity decreases as the altitude of the body increases.
The relation between $g$ and $G$ is $g =\frac{G m}{R^2}$
View full solution →The value of universal gravitational constant is $6.674 \times 10^{-11} Nm ^2 kg ^{-2}$
View full solution → Propulsion of rockets is based Newton’s third law of motion and conservation of linear momentum.
Assertion: The intensity of gravitational field varies with respect to height and depth of a body on the Earth.
Reason: The value of gravitational field intensity depends on height and depth of a body.
Reason: The value of gravitational field intensity depends on height and depth of a body.
- AIf both the assertion and the reason are true and the reason is the correct explanation of assertion.
- BIf both the assertion and the reason are true, but the reason is not the correct explanation of assertion.
- CAssertion is true, but the reason is false.
- ✓Assertion is false, but the reason is true.
Answer: D.
View full solution →Assertion: A mass in the elevator which is falling freely, does not experience gravity.
Reason: Inertial and gravitational masses have equivalence.
Reason: Inertial and gravitational masses have equivalence.
- AIf both the assertion and the reason are true and the reason is the correct explanation of assertion.
- BIf both the assertion and the reason are true, but the reason is not the correct explanation of assertion.
- ✓Assertion is true, but the reason is false.
- DAssertion is false, but the reason is true.
Answer: C.
View full solution →Assertion: A rocket moves forward by pushing the air backwards.
Reason: It derives the necessary thrust to move forwarded according to Newton’s third law of motion.
Reason: It derives the necessary thrust to move forwarded according to Newton’s third law of motion.
- ✓If both the assertion and the reason are true and the reason is the correct explanation of assertion.
- BIf both the assertion and the reason are true, but the reason is not the correct explanation of assertion.
- CAssertion is true, but the reason is false.
- DAssertion is false, but the reason is true.
Answer: A.
View full solution →Assertion: On a rainy day, it is difficult to drive a car at high speed.
Reason: The valve of coefficient of friction is lowered due to polishing of the surface.
Reason: The valve of coefficient of friction is lowered due to polishing of the surface.
- ✓If both the assertion and the reason are true and the reason is the correct explanation of assertion.
- BIf both the assertion and the reason are true, but the reason is not the correct explanation of assertion.
- CAssertion is true, but the reason is false.
- DAssertion is false, but the reason is true.
Answer: A.
View full solution →Assertion: During turning a cyclist negotiates of the curve, while a man sitting in the car leans outwards of the curve.
Reason: An acceleration is acting towards the centre of the curve.
Reason: An acceleration is acting towards the centre of the curve.
- AIf both the assertion and the reason are true and the reason is the correct explanation of assertion.
- BIf both the assertion and the reason are true, but the reason is not the correct explanation of assertion.
- ✓Assertion is true, but the reason is false.
- DAssertion is false, but the reason is true.
Answer: C.
View full solution →When a body falls freely it appears to have zero weight. Give reason.
When a lift falls freely, what happens to the apparent weight of a body in the lift.
When a lift moves with uniform velocity, what is its
(i) acceleration and
(ii) the apparent weight of the person standing inside the lift.
(i) acceleration and
(ii) the apparent weight of the person standing inside the lift.
Is impulse a scalar?
Which law explains the following situation, Athlete runs a certain distance before long jump.
Two ice skaters of weight 60 kg and 50 kg are holding the two ends of a rope. The rope is taut. The 60 kg man pulls the rope with 20 N force. What will be the force exerted by the rope on the other person? What will be their respective acceleration?
A bomb of mass 3 kg, initially at rest, explodes into two parts of 2 kg and 1 kg. The 2 kg mass travels with a velocity of 3 m/s. At what velocity will the 1 kg mass travel?
State Newton’s law of gravitation. Write an expression for acceleration due to gravity on the surface of the earth. If the ratio of acceleration due to gravity of two heavenly bodies is 1 : 4 and the ratio of their radii is 1 : 3, what will be the ratio of their masses?
Calculate the value of acceleration due to gravity on moon. Given mass of moon $=7.4 \times 10^{22}$ $kg$. radius of moon $=1740 km$.
View full solution →Calculate the force of gravitation between two objects of masses $80 kg$ and $120 kg$ kept at a distance of $10 m$ from each other. Given, $G =6.67 \times 10^{-11} Nm ^2 / kg ^2$.
View full solution →Tabulate the apparent weight of person moving in a lift when lift is
(i) moving upwards
(ii) moving downwards
(iii) at rest
(iv) falling down freely.
(i) moving upwards
(ii) moving downwards
(iii) at rest
(iv) falling down freely.
Derive the relation between acceleration due to gravity (g) and Gravitational constant G.
Explain the illustrations for Newton’s third law of motion briefly.
State and explain principle of moments.
Explain the applications of torque.
Match the column A with column B.
Match the column A with column B.
Match the column A with column B.
Match the column A with column B.
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