Test Details

Work and Energy

Dec 26, 3:00 PM

60 minutes

Dec 26, 4:00 PM

40.0 marks

MCQ

20 questions

Madhu Naik

Class Details

Maths

Science

Class 9th

Maths

Science

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Question Text

Question 1 :
Let a constant force, F act on an object. Let the object be displaced through a distance, s in the direction of the force. Let W be the work done. So W = ?

Question 2 :
What is the work to be done to increase the velocity of a car from 30 km $h^{-1}$ to 60 km $h^{-1}$ if the mass of the car is 1500 kg?

Question 3 :
An electric heater is rated 1500 W. How much energy does it use in 10 hours?

Question 4 :
The potential energy of a freely falling object decreases progressively. Does this violate the law of conservation of energy?

Question 5 :
A girl is carrying a school bag of 3 kg mass on her back and moves 200 m on a levelled road. The work done against the gravitational force will be ($g=10 ms^{-2}$)

Question 6 :
The gravitational potential energy of an object at a point above the ground is defined as the work done in raising it from the ground to that point against gravity.

Question 7 :
Avinash can run with a speed of $8 ms^{-1}$ against the frictional force of 10 N, and Kapil can move with a speed of $3 ms^{–1}$ against the frictional force of 25 N. Who is more powerful and why?

Question 8 :
The power of a motor pump is 2 kW. How much water per minute the pump can raise to a height of 10 m? (Given, $g = 10 ms^{-2}$ )

Question 9 :
A girl having mass of 35 kg sits on a trolley of mass 5 kg. The trolley is given an initial velocity of $4 ms^{–1}$ by applying a force. The trolley comes to rest after traversing a distance of 16 m. How much work is done on the trolley?

Question 11 :
The Jog Falls in Karnataka state are nearly 20 m high. 2000 tonnes of water falls from it in a minute. Calculate the equivalent power if all this energy can be utilized? $(g = 10 ms^{–2})$

Question 12 :
A certain household has consumed 250 units of energy during a month. How much energy is this in joules?

Question 14 :
A body is falling from a height h. After it has fallen a height $\frac{h}{2}$ , it will possess

Question 15 :
An electric bulb of 60 W is used for 6 h per day. Calculate the ‘units’ of energy consumed in one day by the bulb.

Question 16 :
A car is accelerated on a levelled road and attains a velocity 4 times of its initial velocity. In this process the potential energy of the car

Question 17 :
A battery lights a bulb. Describe the energy changes involved in the process.

Question 18 :
Calculate the work required to be done to stop a car of 1500 kg moving at a velocity of 60 km/h?

Question 19 :
A 150 kg car engine develops 500 W for each kg. What force does it exert in moving the car at a speed of $20 ms^{–1}?$

Question 20 :
What are the two conditions that are really essential for a work to be done?

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