General Physics Questions And Answers, Set 29

 

General Physics Questions And Answers

Q1. 

Work being a scalar quantity sometimes has negative and positive signs. What does the sign suggest?

Answer :  

Relative directions of force and displacement

Q2. 

A projectile has both change in kinetic and potential energy. Still the work done calculated between any two points is zero. This is due to _________

Answer : 

Inter-conversion of kinetic and potential energies

Q3. 

The unit of energy has been named after ______

Answer : 

James Prescott Joule

Q4. 

A sphere can roll purely on a smooth inclined surface. True or False?

Answer : 

False

Q5. 

Perpendicular axis theorem can be applied for which of the following bodies?

Answer :  

Ring having radius R & negligible cross section

Q6. 

On collision of two balls linear momentum is conserved, it implies that even kinetic energy will remain conserved. True or False?

Answer :  

False

Q7. 

For which of the following does the centre of mass lie outside the body?

Answer : 

Bangle

Q8. 

A uniform disc of radius R is put over another uniform disc of radius 2R of same thickness and density. The edges of the two discs touch each other. What is the position of their centre of mass?

Answer :  

At 3R/5 from the centre of the larger disc

Q9. 

An object is weightless inside a uniform spherical shell.

Answer :  

True

Q10. 

A geostationary satellite seems to be fixed in the sky because it does not orbit the earth.

Answer :  

False

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