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Question Detail
What is newton third law of motion ?
- Every body maintains its initial state rest or motion unless no external force is applied.
- The rate of change in momentum of a body is directly proportional to the applied force on the body and takes place in the direction of force.
- To every action there is equal and opposite reaction.
- None of above.
Answer: Option C
Explanation:
Newton First Law of Motion : Every body maintains its initial state rest or motion unless no external force is applied.
Newton Second Law of Motion : The rate of change in momentum of a body is directly proportional to the applied force on the body and takes place in the direction of force.
1. What are audible sound waves ?
- Having frequency less than 20 Hz
- Having frequency between 20 Hz to 20000 Hz
- Having frequency more than 20000 Hz
- None of above
Answer: Option B
2. The rotational effect of a force on a body about an axis of rotation is described in terms of
- Centre of gravity
- Centripetal force
- Centrifugal force
- Moment of force
Answer: Option D
3. The incident ray, reflected ray and normal to the reflecting surface at the incident point all never lie in same plane.
- True
- False
Answer: Option B
4. Which instrument is used to measure depth of ocean ?
- Galvanometer
- Fluxmeter
- Endoscope
- Fathometer
Answer: Option D
Explanation:
Galvanometer - measures electric current,
Fluxmeter - measures magnetic flux,
Endoscope - used to examine internal parts of the body.
5. If no external force acts on a system of bodies, the total linear momentum of the system of bodies remains constant. Which law states this ?
- Newton first law
- Newton second law
- Newton third law
- Principle of conservation of linear momentum
Answer: Option D
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