# CBSE Worksheet for chapter-6 Sources of Energy class 10

#### Worksheet For class 10

This page is prepared by the Academic team of Physics Wallah which consists of CBSE Board Worksheet for Class 10 Physics. Students of Class 10 Physics can get a free Worksheet for Class 10 Physics in PDF format prepared as per the newest syllabus and examination pattern in your schools.

Standard 10 students can practice questions and answers which are given here for Physics  in Grade 10 that will help them to improve their knowledge of all important chapters and their topics. Students can also download free pdf of Class 10 Physics Notes prepared by teachers and solve important problems provided here with solutions on daily basis to get more scores in school exams and tests.

If any students need to take the online test to check their concepts or undertstanding then they can visit Physics Quiz for Class 10.

## Summary

Nuclear Fission – Fission products, Types of fission reactions, Process of nuclear fission

Nuclear Fusion - Sun’s energy and hydrogen Bomb

### Section 1 - Objective

Q1. The device in which the nuclear fission and release of energy is controlled, is known as:

• Thermopile
• Thermostat
• Nuclear reactor
• Cloud chamber

Q2. For a sustained chain reaction, the reproduction factor should be:

• zero
• on
• two
• three

Q3. Moderator is used in nuclear reactor for:

1. Slowing neutrons
2. Accelerating neutrons
3. Sttopping neutrons
4. Heating the neutrons

Q4. The fusion reaction occur at:

1. Low pressures
2. Low temperature
3. Extremely high temperature
4. High temperature and low pressures

Q5. The source of energy of the sun:

1. Nuclear fission
2. Chemical reaction
3. Nuclear fusion
4. None of these

Q6. The number of neutrons in an atom X of atomic number Z and mass number A is :

1. Zero
2. Z
3. A-Z
4. A

Q7. When a beta particle is given out, the atomic number of the parent atom:

1. Increases by unity
2. Decreases by unity
3. Remains the same
4. Is halved

Q8. Which of the following has least penetrating power?

1. Alpha particles
2. Gamma rays
3. Beta particles
4. All have the same penetrating power

#### SECTION 2 – SUBJECTIVE

Q1. Differentiate between nuclear fission and nuclear fusion.

Q2. Define nuclear fusion reaction. Describe the conditions for the occurrence of a nuclear fusion reaction.

Q3. XRnY--86Po218 + alpha- particles. Find X And Y.

Q4. Name the two major components present in the left-over slurry of a biogas plant.

Q5. Why is charcoal considered to be a better fuel than wood?

Q6. Stae any three characteristics of a good source of energy. Name the gaseous fuel which has the highest calorific value.

Q7. Out of the two elements A and B with mass number 2 and 235 respectively, which one is suitable for making:

(a) a nuclear reactor

(b) a hydrogen bomb

Q8. Name the nuclear reaction involved in each case. Write one difference between the two types nuclear reactions.

### Solutions for Section 1 & 2

#### Objective Problems:

 1. (C) 2. (B) 3. (A) 4. (C) 5. (C) 6. (C) 7. (A) 8. (A)

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