Eexam on Science-1, Chap: 1. Gravitation

Exam on Science-1, Chap: 1 Gravitation 

Shri Bhimsinh Vidyalay Shevga 

Name of Student: 

Science- 1                Chap: 1 . Gravitation             Total Marks: 25

Q1. Fill in the blanks: (5 Marks)

1. The SI unit of mass is ________ , while the SI unit of weight is ________ .  
2. The value of acceleration due to gravity (g) is highest at the ________ and lowest at the ________ .  
3. True free fall is possible only in a ________ .  
4. The value of the universal gravitational constant (G) in SI units is ________ .  
5. The weight of an object on the Moon is approximately ________ of its weight on the Earth.  

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Q2. State whether the following statements are true or false: (4 Marks)

• Mass is a vector quantity whose value changes from place to place.  

Ans.

• The potential energy of an object at an infinite distance from the Earth is considered zero.  

Ans.

• Acceleration due to gravity (g) depends on the mass and properties of the falling object.  

Ans.

• Objects experience weightlessness in space because the value of gravitational acceleration (g) there is zero.  

Ans.

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Q3. Match the following: (4 Marks)

Column A                                                     Column B

1. Mass                                                              A. m/s²

2. Weight                                                          B. Nm²/kg 2

3. Acceleration due to gravity (g)                  C. kg

4. Universal Gravitational Constant (G)      D. N

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Q4. Answer the following in one sentence each: (3 Marks)

1. Where is the center of mass located for a spherical object of uniform density?  

Ans.

2. What is the value of escape velocity on the surface of the Earth?  

Ans.

3. What is the initial velocity (u) of an object during free fall?  

Ans.

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Q5. Define the following terms (any two): (4 Marks)

1. Free fall— 

Ans.

 

 

2. Escape velocity— 

Ans.

 

 

3. Centripetal force— 

Ans.

 

 

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Q6. State the following laws (any two): (5 Marks)

1. Newton’s Universal Law of Gravitation.  

Ans.

 

 

 

2. Kepler’s First Law 

Ans.

 

 

 

3. Kepler’s Third Law 

Ans.

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_*हृदयात माणुसकी आणि भावना असावीच.*_

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*आपला दिवस आनंदी जावो.*🎷