Speed and Velocity Class-7th Goyal Brothers Physics Solutions Ch-2 Unit- 2

Speed and Velocity Class-7th Goyal Brothers Physics Solutions Chapter-2. We Provide Step by Step Answers of Objective, True False , Fill in the blanks, Match the following , Study Questions of Chapter-2 Force and Pressure Unit-2(Speed and Velocity) Visit official Website  CISCE  for detail information about ICSE Board Class-7.

Speed and Velocity Class-7th Goyal Brothers

Physics Solutions Ch-2 Unit-2

Board ICSE
Class 7th
Subject Physics
Book Name Goyal Brothers
Theme-2 Force and Pressure
Unit-2 Speed and Velocity
Topic Solution of exercise questions
Session 2023-24

OBJECTIVE TYPE QUESTIONS

A. Fill in the blanks :

  1. The distance covered by a body in unit time in a specified direction is called _velocity_.
  2. The distance covered by a body in unit time is called _speed_.
  3. When a body covers equal distances in equal interval of _time_ in a specified direction, it is said to be moving with uniform velocity.
  4. The weight is found by a _spring_ balance.
  5. The weight of a body can be _zero_ but not the mass.

B. Statement given below are incorrect. write the correct correct statement:

1. Distance covered by a body in unit time in a specified direction is called its speed.

Correct Statement: Distance covered by a body in unit time in a specified direction is called its velocity.

2. When a body covers unequal distances in equal interval of time, it is said to be moving with variable velocity.

Correct Statement: When a body covers unequal distances in equal interval of time, it is said to be moving with variable velocity.

3. When a body covers equal distances in equal intervals of time in a specified direction, it is said to be moving with uniform speed.

Correct Statement: When a body covers equal distances in equal intervals of time in a specified direction, it is said to be moving with uniform speed.

4. A freely falling stone has uniform velocity.

Correct Statement: A freely falling stone has uniform velocity.

5. Milligram is a multiple of kilogram.

Correct Statement: Milligram is a sub-multiple of kilogram.

C. Write ‘True’ or ‘False’ for the following statements :

  1. When a body starts from rest its initial velocity is zero. [T]
  2. The submultiple of kilogram is quintal. [F]
  3. The acceleration due to gravity is 981 cms-2 . [T]
  4. A horse covering 50 m in 5 s in a straight line has a velocity of 10 ms-1 . [F]
  5. The weight of a body can never be zero. [F]

D. Tick (√) the most appropriate answer.

1. SI unit of weight is :

(a) Kilogram force

(b) gram force

(c) newton

(d) dyne

Ans: (c) newton

2. A beam balance is employed to measure :

(a) pressure

(b)Mass

(c) force

(d) weight

Ans: (b)Mass

3. The SI unit of speed or velocity is  :

(a) cms-1

(b) cms-2

(c) ms-2

(d) ms-1

Ans: (d) ms-1

4. The SI unit of mass is :

(a) milligram

(b) kilogram

(c) gram

(d) quintal

Ans: (b) kilogram

5. A body weighs 2 kgf at equator. Its weight at the poles will be :

(a) same as equator

(b) more than 2 kgf

(c) less than 2 kgf

(d) zero

Ans: (b) more than 2 kgf

E. Match the statement in Column A with those in Column B:

Column A

Column B

1. Distance covered by a body in unit time.

1. Velocity

2. The amount of matter contained in a body.

2. Weight

3. A physical quantity whose magnitude can be zero.

3. Variable velocity

4. Distance covered by a body in unit time, in a specified direction.

4. Mass

5. A body covering unequal direction in equal interval of time, in a specified direction.

5. Speed

Answer:

Column A Column B
1. Distance covered by a body in unit time. 5. Speed
2. The amount of matter contained in a body. 4. Mass
3. A physical quantity whose magnitude can be zero. 2. Weight
4. Distance covered by a body in unit time, in a specified direction. 1. Velocity
5. A body covering unequal direction in equal interval of time, in a specified direction. 3. Variable velocity

STUDY QUESTIONS

Question 1. Define (a) speed, (b) velocity. Bring out clearly the difference between the speed and velocity.

Answer:

(a) The rate of change of motion is called speed.

(b) The rate of change of motion in a specified direction is called its velocity.

The difference between speed and velocity –

Speed

Velocity

1. The rate of change of motion is called speed. 1. The rate of change of motion in a specified direction is called its velocity

2. It is a scalar quantity.

2. It is a vector quantity.

3. It cannot be zero.

3. It can be zero.

4. Speed = Distance/Time 4. Velocity = Displacement/Time

Question 2. Give an example of body moving with (a) uniform velocity (b) variable velocity. Define the both terms.

Answer: 

(a) Uniform Velocity: A body is said to be moving with uniform velocity if its average velocity between any two points along its path is the same in magnitude as well as direction.

example: A car moving on a straight road and covers 10 m in every second.

(b) Variable Velocity: When the displacement of the body is different in equal interval of time then the velocity is called variable velocity.

example: A freely falling stone is moving with a variable velocity.

Question 3. Define mass. State SI unit of mass.

Answer: Mass is the amount of matter contained in the body. It is a constant quantity for a given substance. The mass is found by using a beam balance or a physical balance.

The SI unit of mass is kilogram (Kg).

Question 4.

(a) Define weight

Answer: Weight is the force with which the earth pulls a body towards its center. The weight of a body is not a constant quantity, but depends upon the acceleration due to gravity acting on the body.

(b) State and define SI unit of weight.

Answer: SI unit of weight is Newton (N) . The amount of force acting on a body, when earths pulls a mass 100 g is equals to one Newton.

Question 5. State four differences between mass and weight.

Answer: Difference between mass and weight.

Mass Weight
1.Mass is the amount of matter contained in a body. 1.Weight is the force with which the earths attracts a body towards its centre.
2. Mass is a scalar quantity 2. Weight is a vector quantity
3. SI unit of mass is Kilogram (Kg). 3. SI unit of Weight is Newton (N).
4. Mass of a body can never be zero. 4.  Weight of a body can be zero.

 

— : end of Speed and Velocity Class-7th ch-2 unit-2 Goyal Brothers :–-

Return to- ICSE Class -7 Goyal Brothers Physics Solutions

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