Dynamics – MCQ’s

MCQ’s
Chapter 3 – Dynamics
Class 9 Physics Notes
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Dynamics – MCQ’s

  1. Laws of motion was presented by:

(a) Einstein

(b) Newton ✓

(c) Galileo

(d) Archimedes

  1. Isaac Newton described the laws of motion in his famous book:

(a) Qanoon-ul-Masoodi

(b) Principia Mathematica ✓

(c) Kitab-ul-Astralab

(d) Al-Manazir

  1. The laws of motion established the relationship between motion and ——–:

(a) Force ✓

(b) Torque

(c) Acceleration

(d) Momentum

  1. First law of motion is also known as law of —————:

(a) Torque

(b) Acceleration

(c) Inertia ✓

(d) None of these

  1. ————— of a body is the direct measure of inertia:

(a) Mass ✓

(b) Energy

(c) Momentum

(d) All of above

  1. The characteristic of a body due to which it tends to retain its state of rest or of uniform motion is known as:

(a) Weight

(b) Force

(c) Inertia ✓

(d) Momentum

  1. ————— is the agency which changes or tends to change the state of rest or of uniform motion of a body:

(a) Weight

(b) Force ✓

(c) Inertia

(d) Momentum

  1. Law of inertia is actually the ———– law of motion:

(a) First  ✓

(b) Second

(c) Third

(d) Fourth

  1. When a force is applied on the body, ————– is produced in the body:

(a) Weight

(b) Acceleration ✓

(c) Energy

(d) None of the above

  1. The acceleration produced in a moving body is always in the direction of applied —————:

(a) Velocity

(b) Force ✓

(c) Speed

(d) Momentum

  1. If mass of the body is doubled while keeping the force constant, then acceleration will be:

(a) One half ✓

(b) doubled

(c) One fourth

(d) Four times

  1. If force applied on the body is doubled while keeping the mass constant, then acceleration will be:

(a) One half

(b) doubled  ✓

(c) One fourth

(d) Four times

  1. SI unit of force is:

(a) Kilogram

(b) Dynes

(c) newton ✓

(d) Pound

  1. When a force of 8 newton is applied on a body of mass 2 kg, then the acceleration produced will be:

(a) 16 ms-2

(b) 4 ms-2  ✓

(c) 0.4 ms-2

(d) 160 ms-2

  1. 1 N = —————– (GRW 2014)

(a) kgms-2  ✓

(b) kgms-1

(c) kgm2s-1

(d) kg2ms-2

  1. Action and reaction are equal in magnitude but opposite in direction is known as ————— law of motion:

(a) First

(b) Second

(c) Third    ✓

(d) Fourth

  1. Walking on road is an example of —————— law of motion:

(a) First

(b) Second

(c) Third ✓

(d) Fourth

  1. When a block is lying on a smooth surface, its weight is balanced by:

(a) Mass

(b) Momentum

(c) Inertia

(d) Normal Reaction ✓

  1. The weight of a body of mass 10 kg on earth will be —————–:

(a) 10 N

(b) 1 N

(c) 100 N ✓

(d) 1000 N

  1. The ————- of a body always acting towards the center of the earth:

(a) Mass

(b) Force

(c) Velocity

(d) Weight ✓

  1. Quantity of matter in a body:

(a) Mass ✓

(b) Force

(c) Velocity

(d) Weight

  1. The Force with which earth attracts a body towards its centre is known as:

(a) Mass

(b) Force

(c) Weight  ✓

(d) Inertia

  1. The characteristic of a body which determines the magnitude of acceleration produced when a certain force acts upon it:

(a) Mass   ✓

(b) Force

(c) Inertia

(d) Weight

  1. Mass of the body is measured by:

(a) Free Fall Apparatus

(b) Physical balance   ✓

(c) Spring balance

(d) All of above

  1. Weight of the body is measured by:

(a) Free Fall Apparatus

(b) Physical balance

(c) Spring balance   ✓

(d) All of above

  1. Unit of weight is:

(a) kg

(b) ms-1

(c) Nm

(d) N ✓

  1. —————- of a body remains same every where:

(a) Weight

(b) Acceleration

(c) Velocity

(d) Mass ✓

  1. ————— of a body does not remain same every where:

(a) Weight  ✓

(b) Inertia

(c) Mass

(d) All of above

  1. The value of weight of a body of constant mass depends on:

(a) Inertia

(b) Momentum

(c) Force

(d) ‘g’ ✓

  1. Mass is a ————– quantity:

(a) Scalar    ✓

(b) Vector

(c) Derived

(d) Negative

  1. Weight is a ————– quantity:

(a) Scalar

(b) Vector ✓

(c) Unitless

(d) Negative

  1. When a block is hanging with the help of a rope then weight of the body is balanced by:

(a) Acceleration

(b) Inertia

(c) Displacement

(d) Tension ✓

  1. There are ——– cases of motion of the body hanging with the help of rope:

(a) 1

(b) 2  ✓

(c) 3

(d) 4

  1. The tension produced when one body moves vertically and the other moves horizontally is ————— as compared to the tension produced when both bodies move vertically:

(a) Half      ✓

(b) One fourth

(c) Double

(d) Four times

  1. Quantity of motion in a body is known as:

(a) Mass

(b) Momentum   ✓

(c) Velocity

(d) Acceleration

  1. Product of mass and velocity is known as:

(a) Force

(b) Speed

(c) Momentum ✓

(d) Acceleration

  1. SI unit of Momentum is:      (GRW 2013, LHR 2015)

(a) Kgms-2

(b) Ns

(c) Kgms-1

(d) Both b & c ✓

  1. Kgms-1 = ————–

(a) N

(b) J

(c) Ns   ✓

(d) W

  1. Rate of change of momentum is equal to:

(a) Force  ✓

(b) Velocity

(c) Acceleration

(d) Impulse

  1. Direction of the rate of change of momentum is in the direction of:

(a) Acceleration

(b) Momentum

(c) Velocity

(d) Force ✓

  1. The force which resists the motion of one surface on another surface is known as:

(a) Gravity

(b) Friction  ✓

(c) Weight

(d) Repulsion

  1. When object is at rest, the force of friction is known as ————- friction:

(a) Static       ✓

(b) Limiting

(c) Kinetic

(d) Dynamics

  1. The maximum value of static friction is known as ————- friction:

(a) Static

(b) Limiting ✓

(c) Kinetic

(d) Dynamics

  1. When an object is in motion then the force of friction is known as —–friction:

(a) Static

(b) Limiting

(c) Kinetic ✓

(d) Dynamics

  1. Static friction is ————— than kinetic friction:

(a) Less

(b) Quartered

(c) Greater ✓

(d) Equal

  1. Rolling friction is ————— than Sliding friction:

(a) Less  ✓

(b) Quartered

(c) Greater

(d) Equal

  1. The coefficient of friction has ————– unit:

(a) Newton

(b) Dynes

(c) No   ✓

(d) Kilogram

  1. Friction of liquids is ————— than friction of solids:

(a) Less    ✓

(b) Quartered

(c) Greater

(d) Equal

  1. Coefficient of friction does not depend upon the ———– between two surfaces:

(a) Area of contact  ✓

(b) Normal Reaction

(c) Weight

(d) Roughness

  1. The rolling friction is about ————- times smaller than sliding friction:

(a) 10

(b) 50

(c) 100  ✓

(d) 1000

  1. Friction in the human joints is much reduced due to the presence of:

(a) Bones

(b) Muscles

(c) Fluid ✓

(d) Gas

  1. Value of coefficient of friction (μk) depends upon:

(a) Nature of the surfaces ✓

(b) Area of contact

(c) Force

(d) All of above

  1. The Rotation of water sprinkler is an example of ———- law of motion:

(a) First

(b) Second

(c) Third   ✓

(d) Fourth

  1. A spider web remains intact due to:

(a) Weight

(b) Momentum

(c) Tension  ✓

(d) None of these

  1. Momentum of a moving body depends upon its:

(a) Mass

(b) Velocity

(c) Weight

(d) Both a & b ✓

  1. Motion of the rocket is an example of:

(a) First law of motion

(b) Law of conservation of Momentum ✓

(c) Law of conservation of Energy

(d) Weight

  1. Value of coefficient of static friction (μs) is usually ————- than coefficient of kinetic friction (μk):

(a) Less

(b) Quartered

(c) Greater  ✓

(d) Equal

  1. When air is released from an inflated balloon, it shoots off is an example of:

(a) First law of motion

(b) Law of conservation of Energy

(c) Weight

(d) Law of conservation of Momentum ✓

  1. Sliding friction is commonly converted into Rolling friction by the use of:

(a) Ball bearing ✓

(b) Oil

(c) Grease

(d) Polish

  1. The front sides of high speed vehicles, aeroplanes and ships are shaped wedge like to reduce:

(a) Weight

(b) Pressure

(c) Speed

(d) Friction ✓

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