Test: Work and Energy- Case Based Type Questions- 2

# Test: Work and Energy- Case Based Type Questions- 2 - Class 9

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## 10 Questions MCQ Test Physics for Class 9 - Test: Work and Energy- Case Based Type Questions- 2

Test: Work and Energy- Case Based Type Questions- 2 for Class 9 2023 is part of Physics for Class 9 preparation. The Test: Work and Energy- Case Based Type Questions- 2 questions and answers have been prepared according to the Class 9 exam syllabus.The Test: Work and Energy- Case Based Type Questions- 2 MCQs are made for Class 9 2023 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Work and Energy- Case Based Type Questions- 2 below.
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Test: Work and Energy- Case Based Type Questions- 2 - Question 1

### Direction: Study the given passage and answer the following questions .The following diagram shows that a simple pendulum consisting of a bob of mass 100 gm. Initially the bob of the pendulum is at rest at ‘O’. It is then displaced to one side at A. The height of ‘A’ above ‘O’ is 5 cm. (Take g = 10 m/s2) Q. What is the value of potential energy of bob at ‘A’ and where does it come from?

Detailed Solution for Test: Work and Energy- Case Based Type Questions- 2 - Question 1
PE = mgh = 0.1 x 10 x 5 x 10-2 = 0.05 J

The work done in raising the bob through a height of 5 cm (against the gravitational attraction) gets stored in the bob in the form of its potential energy.

Test: Work and Energy- Case Based Type Questions- 2 - Question 2

### Direction: Study the given passage and answer the following questions .The following diagram shows that a simple pendulum consisting of a bob of mass 100 gm. Initially the bob of the pendulum is at rest at ‘O’. It is then displaced to one side at A. The height of ‘A’ above ‘O’ is 5 cm. (Take g = 10 m/s2) Q. What is the value of kinetic energy of the bob at mean position ‘O’?

Detailed Solution for Test: Work and Energy- Case Based Type Questions- 2 - Question 2
At mean position, potential energy is zero, Hence K.E. at O = 0.05 J
Test: Work and Energy- Case Based Type Questions- 2 - Question 3

### Direction: Study the given passage and answer the following questions .The following diagram shows that a simple pendulum consisting of a bob of mass 100 gm. Initially the bob of the pendulum is at rest at ‘O’. It is then displaced to one side at A. The height of ‘A’ above ‘O’ is 5 cm. (Take g = 10 m/s2) Q. What is the value of total energy of the bob at position A?

Detailed Solution for Test: Work and Energy- Case Based Type Questions- 2 - Question 3
At position A, PE = 0.05 J, KE = 0

So, Total energy = 0.05 J

Test: Work and Energy- Case Based Type Questions- 2 - Question 4

Direction: Study the given passage and answer the following questions .

The following diagram shows that a simple pendulum consisting of a bob of mass 100 gm. Initially the bob of the pendulum is at rest at ‘O’. It is then displaced to one side at A. The height of ‘A’ above ‘O’ is 5 cm. (Take g = 10 m/s2) Q. What is kinetic energy?

Detailed Solution for Test: Work and Energy- Case Based Type Questions- 2 - Question 4
Kinetic energy is the energy of motion, observable as the movement of an object, particle, or set of particles. Any object in motion is using kinetic energy: a person walking, a thrown baseball, a crumb falling from a table, and a charged particle in an electric field are all examples of kinetic energy at work.
Test: Work and Energy- Case Based Type Questions- 2 - Question 5

Direction: Study the given passage and answer the following questions .

The following diagram shows that a simple pendulum consisting of a bob of mass 100 gm. Initially the bob of the pendulum is at rest at ‘O’. It is then displaced to one side at A. The height of ‘A’ above ‘O’ is 5 cm. (Take g = 10 m/s2) Q. What is the value of kinetic energy and potential energy of the bob at the position ‘P’ whose height above O is 2 cm?

Detailed Solution for Test: Work and Energy- Case Based Type Questions- 2 - Question 5
PE at P = mgh = 0.1 x 10 x 2 x 10-2 = 0.02 J

K.E = Total energy - PE = 0.05-0.02 = 0.03 J

Test: Work and Energy- Case Based Type Questions- 2 - Question 6

Study the given passage and answer any four questions.

In the month of September, four devices of power 100 W each is used for 10 hours daily.

Q. Find the energy in kWh.

Detailed Solution for Test: Work and Energy- Case Based Type Questions- 2 - Question 6
Energy consumed by four devices in the month of September = 4 × (100/1000) × 10 × 30 = 120 kWh.
Test: Work and Energy- Case Based Type Questions- 2 - Question 7

Study the given passage and answer any four questions.

In the month of September, four devices of power 100 W each is used for 10 hours daily.

Q. Relate 1 kWh to joules.

Detailed Solution for Test: Work and Energy- Case Based Type Questions- 2 - Question 7
One kilowatt-hour is equivalent to the energy of 1,000 joules used for 3,600 seconds or 3.6 million Joules. In equation form: 1 kWh = 3.6 million J.
Test: Work and Energy- Case Based Type Questions- 2 - Question 8

Study the given passage and answer any four questions.

In the month of September, four devices of power 100 W each is used for 10 hours daily.

Q. Define 1 kWh.

Detailed Solution for Test: Work and Energy- Case Based Type Questions- 2 - Question 8
A kilowatt hour (kWh) is a unit of measurement of energy. A kilowatt hour therefore refers to the consumption of your device. 1 kilowatt hour (kWh) is the energy consumed by a 1,000-watt or 1-kilowatt electrical appliance operating for 1 hour.
Test: Work and Energy- Case Based Type Questions- 2 - Question 9

Study the given passage and answer any four questions.

In the month of September, four devices of power 100 W each is used for 10 hours daily.

Q. If the heater works 60 joules in one minute, what is its power?

Detailed Solution for Test: Work and Energy- Case Based Type Questions- 2 - Question 9
P = W/T = 60/60 = 1 J/s =1 W
Test: Work and Energy- Case Based Type Questions- 2 - Question 10

Study the given passage and answer any four questions.

In the month of September, four devices of power 100 W each is used for 10 hours daily.

Q. Define power.

Detailed Solution for Test: Work and Energy- Case Based Type Questions- 2 - Question 10
We can define power as the rate of doing work, it is the work done in unit time. The SI unit of power is Watt (W) which is joules per second (J/s). Sometimes the power of motor vehicles and other machines is given in terms of Horsepower (hp), which is approximately equal to 745.7 watts.

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## Physics for Class 9

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