Test Details

Work, Energy and Power

Jan 17, 2:00 PM

120 minutes

Jan 17, 4:00 PM

30.0 marks

MCQ

15 questions

MOTION PHYSICS CLASSES

Class Details

Physics

MOTION PHYSICS CLASSES 11

Physics

FOR :- XI , XII , IIT-JEE & NEET

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Question Text

Question 1 :
A tap supplies water at 22C. A man takes 11 liter water per minute at 37C from the geyser. The power of geyser is

Question 2 :
The driving side belt has a tension of $1600\ N$ and the slack side has $500\ N$ tension. The belt turns a pulley $40\ cm$ in radius at a rate of $300\ rpm$. The pulley drives a dynamic having $90\%$ efficiency. How many kilowatt are being delivered by the dynamo?

Question 4 :
A vehicle of mass $1000 \ kg$ is moving with a velocity of $15\  m s^{-1}$. It is brought to rest by applying brakes and locking the wheels. If the sliding friction between the tires and the rod is $6000 \ N$, distance moved by the vehicle before coming to rest is:

Question 5 :
How much work is needed to be done on a ball of mass $50 g$ to give it a momentum of $500 g cm s^{-1}$?

Question 6 :
Certain force acting on a 20 kg mass changes its velocity from $5 \:ms^{-1}$ to $2 \:ms^{-1}$. Calculate the work done by the force.

Question 8 :
The work done in lifting 1 kg mass to a height of 9.8 m is about

Question 9 :
The potential energy between two atoms in a molecule is given by $ U(x) = \frac {a}{x^{12} } - \frac {b}{x^6} $ where $ a $ and $ b $ are positive constants and $ x $ is the distance between the atoms .The atom is in stable equilibrium when 

Question 10 :
A vessel containing $50kg$ of water is placed at a height $15m$ above the ground. Assuming the gravitational potential energy at ground to be zero, what will be the gravitational potential energy of water in the vessel? Consider $g=10ms^{-2}$.

Question 11 :
Which of the following is not an example of potential energy?

Question 12 :
An object in a given position can have a certain potential energy with respect to one level and a different value of potential energy with respect to another level.

Question 13 :
Two bodies of equal weight are kept at heights of h and 1.5h respectively. The ratio of their P.E. is_____

Question 14 :
The weight of a person on a planet A is about half that on the Earth. He can jump upto 0.4 m height on the surface of the Earth. How high he can jump on the planet A ?

Question 15 :
A student sitting at the top of a tree has ............ than the student who is sitting on the ground.

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