Question 5 :
Which of the following must be known in order to determine the power output of an automobile? <br>
Question 6 :
A machine gun fires $420$ bullets $per\ minute$. The velocity of each of the bullets is $300 m s^{-1}$ and the mass of each bullet is $1 gm$. The power of machine gun is:
Question 7 :
An X-ray tube is run at 50 kV.. the current flowing in it is 20 mA. The power of the tube is:
Question 9 :
Six electric appliances of 100 watts each are used for 6 hours. The electrical energy consumed is:
Question 10 :
Assertion: Kilowatt Hour is the unit of electric power
Reason: KWH is a commercial unit used for expressing consumed electrical energy.
Question 11 :
If the power of the motor of a water pump is $3\ kW$, then the volume of water that can be liftedto a height of $10\ m$ in one minute by the pump is ($g= 10 \ m /s^{2}$) :
Question 12 :
A machine gun fires $240$ bullets $per\ minute$ with a certain velocity. If the mass of each bullet is $10 gm$ and the power of the gun is $7.2 kW$, the velocity with which each bullet is fired must be:
Question 14 :
If a man of $30$ kilograms climbs stairs in $4$ seconds when height of stairs is $5$ meters, power output produced will be:<br/>
Question 15 :
If the force applied is $F$ and the velocity gained is $v$, then the power developed is:
Question 19 :
A car of mass $2,000 kg$ is lifted up a distance of $30 m$ by a crane in $1\ minute$. A second crane does the same job in $2\ minutes$.The power supplied by first crane is:
Question 21 :
A man weighing 600 N carries a load of 150 N up the stairs 6 m high in 15 seconds. His power will be:
Question 23 :
A house uses 7 tubelight of 50 W each for 5 hours a day. The electrical energy consumption for one day is:
Question 24 :
A man can lift a block of mass of 50 kg up to a height of 2 m in 2 seconds. Calculate the power developed by the man to lift the block.
Question 27 :
Which of the following can be used to express energy? Symbols have their usual meanings for the units of physical quantities.<br/>(i) Wh   (ii) VC    (iii) VAs$^2$  (iv)  A$^2\Omega$s<br/>
Question 28 :
A juggler throws continuously balls at the rate ofthree in each second each with a velocity of $10\ ms^{-1}$. If the mass of each ball is $0.05\ kg$ hispower is:
Question 30 :
Mohan uses one television of $100$ W for $10$ hrs how much energy is consumed by Mohan.
Question 31 :
A particle of mass m is moving in a circular path of radius R such that its centripetal acceleration $a_c$ is varying with time as $a_c=kr^2t^3$, where k$=$constant. The power delivered to the particle by the force acting on it is?
Question 32 :
A motor pump lifts $6$ tonnes of water from a well of depth $2 m$ to the first floor of height $35 m$ from the ground floor in $20$ minutes. The power of the pump (in $kW$) is $\left[ g=10{ ms }^{ -2 } \right] $
Question 33 :
A motor of power $P_0$ is used to deliver water at a certain rate through a given horizontal pipe. To increase the rate of flow of water through the same pipe $n$ times, the power of the motor is increased to $P_1$. The ratio of $P_1$to$P_0$is
Question 34 :
The power of a water jet flowing through an orifice of radius 10 cm with a velocity $\displaystyle 5\ { ms }^{ -1 }$ is :
Question 35 :
A satellite is fired from the surface of the moon of mass $M$ and radius $R$ with speed $\displaystyle v_{0}\:\:  at\: \: 30^{\circ}$ with the vertical The satellite reaches a maximum distance of $\displaystyle \frac{5R}{2}$ from the center of the moon The value of $\displaystyle v_{0}$ is
