Potential energy Quiz 1

Question 1

Arun saw a dream where he kept a bottle of mass $$m$$ at the centre of earth. The next day he thought about the gravitational potential energy of the bottle at the centre of earth. Can you help him to find it?

Accepted Answer

$$\infty $$

Answer

A positive constant

Answer

$$0$$

Answer

A negative constant

Question 2

What will be the approximate gravitational potential energy of a body at a distance $$79\,R$$ from earth surface?

Accepted Answer

Zero

Answer

$$\infty $$

Answer

A negative constant

Answer

None of these

Question 3

The potential energy of a spring mass system has been given as $$80\,J$$ and the spring constant is having a value of $$40\,N{{m}^{-1}}$$. The velocity of the mass at a time $$t=4\,s$$ will be?

Accepted Answer

$$8\,m{{s}^{-1}}$$

Answer

$$0\,m{{s}^{-1}}$$

Answer

$$200\,m{{s}^{-1}}$$

Answer

$$20\,m{{s}^{-1}}$$

Question 4

The acceleration of a ball having a mass $$4\,kg$$ has been given as $$a={{\left( r+2 \right)}^{2}}$$. The ball is being moved in a one dimensional path from $$r=3$$ to $$r=7$$. Calculate the potential energy of the body.

Accepted Answer

$$805.33\,J$$

Answer

$$635.33\,J$$

Answer

$$605\,J$$

Answer

$$787.9\,J$$

Question 5

In an experiment, an electron has a displacement of $$\dfrac{5}{4}	ext{ n}m$$ placed in an electric field of magnitude $$400\,V{{m}^{-1}}$$. The electron is also found to travel at an angle of $$\dfrac{\pi }{3}$$ with the electric field. Find out the value of potential energy of this system.

Accepted Answer

$$4.225	imes {{10}^{-26}}\,J$$

Answer

$$3.33	imes {{10}^{-28}}\,J$$

Answer

$$3.33	imes {{10}^{-26}}\,J$$

Answer

$$4.225	imes {{10}^{-28}}\,J$$