Work Quiz 1

Question 1

Density of a special fluid flowing through a pipe kept at a height of $$3	ext{ }m$$ has been mentioned as $$30	ext{ kg}{{	ext{m}}^{-3}}$$. The area of cross section of the pipe has been given as $$10	ext{ }{{m}^{2}}$$and the volume of water has been mentioned as $$100	ext{ }{{m}^{3}}$$. Calculate the work done for the flow of fluid.

Accepted Answer

$$9	imes {{10}^{4}}	ext{ }J$$

Answer

$$3	imes {{10}^{3}}	ext{ }J$$

Answer

$$4.6	imes {{10}^{3}}	ext{ }J$$

Answer

$$2	imes {{10}^{4}}	ext{ }J$$

Question 2

Ammu applied a force of $$4	ext{ }N$$ due to which a velocity has been generated as $$2	ext{ }m{{s}^{-1}}$$.  Calculate the work done in a time taken mentioned as $$4	ext{ }s$$.

Accepted Answer

$$32	ext{ }J$$

Answer

$$12	ext{ }J$$

Answer

$$2	ext{ }J$$

Answer

$$16	ext{ }J$$

Question 3

When a certain amount of electrical energy has been passed through a wire, it gets heated up. The reading in the voltmeter has been shown as $$5	ext{ }V$$ and the resistance of the wire has been mentioned as $$50	ext{ }\Omega $$. Calculate the work done when $$5	ext{ }V$$ voltage has been applied for $$1\min $$ time.

Accepted Answer

$$30	ext{ }J$$

Answer

$$44	ext{ }J$$

Answer

$$4	ext{ }J$$

Answer

$$16	ext{ }J$$

Question 4

One ball is being bounced on a floor where the velocity of rebound is $$33	ext{ }m{{s}^{-1}}$$. It was noticed that the ball bounces up to the height of a boy standing nearby who is $$10	ext{ }m$$ tall.What will be the value of velocity of separation if the value of velocity of approach be $$3	ext{ }m{{s}^{-1}}$$ ?

Accepted Answer

$$7	ext{ }m{{s}^{-1}}$$

Answer

$$14	ext{ }m{{s}^{-1}}$$

Answer

$$5	ext{ }m{{s}^{-1}}$$

Answer

$$13	ext{ }m{{s}^{-1}}$$

Question 5

Hima found that a body of mass $$	ext{3 }kg$$ has a potential energy mentioned as $$V=3yz$$ in a specific force field which is conservative. What will be the acceleration exerted on this body?

Accepted Answer

$$-z\hat{j}-y\hat{k}$$

Answer

$$z\hat{j}+y\hat{k}$$

Answer

$$-3z\hat{j}-3y\hat{k}$$

Answer

$$3z\hat{j}+3y\hat{k}$$