Power Quiz 1

Question 1

Vinod once applied a force, $$F=(2x+2y)	ext{ }N$$ on a body due to which it started a motion with a velocity, $$V=(5x+3y)	ext{ }m{{s}^{-1}}$$. What will be the power of this body?

Accepted Answer

$$16	ext{ }W$$

Answer

$$6	ext{ }W$$

Answer

$$60	ext{ }W$$

Answer

$$160	ext{ }W$$

Question 2

A body of mass $$4	ext{ }kg$$ was moving with a power which has been mentioned as $$25	ext{ }W$$. The time taken for this body to complete a displacement of $$6	ext{ }m$$ was mentioned as $$5	ext{ }s$$. Find out the acceleration related to this.

Accepted Answer

$$5.208	ext{ }m{{s}^{-2}}$$

Answer

$$2	ext{ }m{{s}^{-2}}$$

Answer

$$9.08	ext{ }m{{s}^{-2}}$$

Answer

$$4.5	ext{ }m{{s}^{-2}}$$

Question 3

Leena, a girl of $$50	ext{ }kg$$ was sitting over a tree which is at a height of $$5	ext{ }m$$. She sat on the tree for $$50	ext{ }s$$. What will be the power of Leena when she is sitting on a tree?

Accepted Answer

$$50	ext{ }W$$

Answer

$$0	ext{ }W$$

Answer

$$550	ext{ }W$$

Answer

$$5	ext{ }W$$

Question 4

A machine which was invented by Carol will be providing an output power mentioned to be $$51	ext{ }W$$. The efficiency of the machine was mentioned to be $$0.6$$. How much energy will be taken inside by the machine in order to work for an hour?

Accepted Answer

$$3.06	imes {{10}^{5}}	ext{ }J$$

Answer

$$5	imes {{10}^{5}}	ext{ }J$$

Answer

$$6	imes {{10}^{5}}	ext{ }J$$

Answer

$$3.06	imes {{10}^{7}}	ext{ }J$$

Question 5

Venu connected one pipe of area of cross section $$60	ext{ }{{m}^{2}}$$.  When it is connected, the velocity of water flowing through it will be $$10	ext{ }m{{s}^{-1}}$$for a time interval of $$4	ext{ }s$$. The kinetic energy thus formed has been transformed into electrical energy in a circuit where the current will be $$5	ext{ }A$$. Calculate the potential difference in the electrical circuit. Take the density of water as $$1000	ext{ }kg{{m}^{-3}}$$.

Accepted Answer

$$6	imes {{10}^{5}}	ext{ }V$$

Answer

$$6	imes {{10}^{6}}	ext{ }V$$

Answer

$$7	imes {{10}^{6}}	ext{ }V$$

Answer

$$3	imes {{10}^{5}}	ext{ }V$$