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Class 9 Science|physics Important Questions for Work and Energy






Given below are the Class 9 Science Important Questions for work and energy
a. Concepts questions
b. Calculation problems
c. Multiple choice questions
d. Long answer questions
e. Fill in the blank's

Short Answer Based questions

  1. What is unit of energy?
  2. The total energy when a body falls freely towards earth remains constant.  True or false?
  3. What do you mean by kinetic energy of the body?
  4. If the mass of the body is doubled and velocity is made halved, the kinetic energy will become?
  5. Potential energy  is a vector quantity True or false?
  6. When the force acts at right angle to the direction of motion, what is the work done by the force
  7. What is Power?
  8. What is Law of conservation of energy?

Match the column

Column A
(Energy Conversion)

Column B
(Converters)
Chemical energy into Mechanical energy
Electric Generator
Heat energy into Mechanical engine
Electric Motor
Mechanical energy into Electrical energy         Car engine
Electrical energy to Mechanical energy
Steam engine
Light energy into electrical energy
Electric bulb
Electrical energy into light energy
Solar Cell

Table type question

A force 10 N act on the body and body is displaced by 10 m. The angle between force and displacement are given below. Calculate the work done
Angle
30
45
60
90
Work done
?
?
?
?



Table type question

A body of mass 10 kg falls from the height 10 m towards the earth. Given g=10m/s2
Height from earth(m)
10m
?
?
2m
Potential energy(J)
?
?
500J
?
Kinetic energy(J)
?
1000J
?
?
Mechanical energy (J)
?
?
?
?

Fill in the blanks

  1. 1 Kilo Watt hour of energy is equal to ________ Joule
  2. Power is the rate of doing ______. And its unit is ___________
  3. Work done by the force can be _______ and ______.
  4. The water stored in the reservoir of the tank possessed _______ energy
  5. The total energy of the swinging pendulum remains ______ at all the points
  6. When the body falls freely towards earth ,potential energy of the body _______while kinetic energy of the body______. The total remains ______at all the point during the motion

Crossword Puzzle

Crossword puzzle for work and energy for class 9
Across
2. The scientist with whom unit of power is named
5. The kinetic energy of the body depends on mass and this quantity
7. The energy possessed by the car moving on the road
8. The Bigger unit of power
9. Work and power are these quantities
Down
1. The work done by the earth on the satellite moving in circular path
3. Solar water heater converts this energy into heat energy
4. The gravitation potential energy is present because of this
6. In hydroelectric power house, the potential energy of the water is finally transformed to this energy

Short Answer type question

Question 1.
An electric bulb of 100 W is used for 8 h per day. Calculate the 'units' of energy consumed in one day by the bulb?

Question 2.
Find the energy possessed by an object of mass 10 kg when it is at a height of 2 m above the ground. Given, g = 10 m/s2.

Question 3.
An engineer is asked to design a playground slide such that the speed a child reaches at the bottom does not exceed 4.0 m/s. Determine the maximum height that the slide can be.?Given, g = 9.8 m/s2.

Question 4.
Which one of the following is not the unit of energy?
(a) joule
(b) newton metre
(c) kilowatt
(d) kilowatt hour

Question 5.
A rocket is moving up with a velocity v. If the velocity of this rocket is suddenly tripled, what will be the ratio of two kinetic energies?

Question 6.
A force of 10 N displaces a body by a distance of 3 m at an angle 60° to its own direction. Find the amount of work done.


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Class 9 Maths Class 9 Science
Reference Books for class 9 science

Given below are the links of some of the reference books for class 9 science.

These books by S.Chand Publications are detailed in their content and are must have books for class 9 students.
  1. Science for Ninth Class Part1 Physics
  2. Science for Ninth Class Part2 Chemistry
  3. Science for Ninth Class Part3 Biology
Some other books that might be worth considering are
  1. Oswaal CBSE Question Bank Class 9 Science Chapterwise & Topicwise We all know importance of practicing what we have studied. This book is perfect for practicing what you have learned and studied in the subject.
  2. Pearson Foundation Series (IIT-JEE/NEET) Physics, Chemistry, Maths & Biology for Class 9 (Main Books) | PCMB Combo These Foundation books would be helpful for students who want to prepare for JEE/NEET exams. Only buy them if you are up for some challenge and have time to study extra topics. These might be tough for you and you might need extra help in studying these books.
  3. Foundation Science Physics for Class - 9 by H.C. Verma This is one of my favorite Physics book for class 9. Most of the book is within the limits of CBSE syllabus. It might overwhelm you with its language but I feel if you can understand the content is authentic with plenty of problems to solve.

You can use above books for extra knowledge and practicing different questions.







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