Work, Energy and Power Test

Result

Work, Energy and Power Test - 40

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Weekly Quiz Competition

Question 1
4 / -1

A force acts on a 30 g particle in such a way that the position of the particle as a function of time is given by x = 3t – 4t² + t³, where x is in meters and t is in seconds. The work done during the first 4 sec is

A
5.28 J

B
450 mJ

C
490 mJ

D
530 mJ

Solution
Question 2
4 / -1

A body of mass 10 kg is dropped to the ground from a height of 10 m. The work done by the gravitational force is (g = 9.8 m/s²)

A
–490 J

B
+ 490 J

C
–980 J

D
+ 980 J

Solution
Question 3
4 / -1

Which of the following is a scalar quantity?

A
Displacement

B
Electric field

C
Acceleration

D
Work
Question 4
4 / -1

A particle of mass 100 g is thrown vertically upwards with a speed of 5 m/s. The work done by the force of gravity during the time, the particle goes up is

A
–125 J

B
1.25 J

C
0.5 J

D
–0.5 J

Solution
Question 5
4 / -1

A force of 5 N acts on a 15 kg body initially at rest. The work done by the force during the first second of motion of the body is

A
5 J

B

C
6 J

D
75 J

Solution
Question 6
4 / -1

A force of 5 N, making an angle θ with the horizontal, acting on an object displaces it by 0.4 m along the horizontal direction. If the object gains kinetic energy of 1J, the horizontal component of the force is

A
1.5 N

B
2.5 N

C
3.5 N

D
4.5 N

Solution
Question 7
4 / -1

The work done against gravity in taking 10 kg mass at 1m height in 1sec will be

A
49 J

B
98 J

C
196 J

D
None of these

Solution
Question 8
4 / -1

The energy which an e^– acquires when accelerated through a potential difference of 1 volt is called

A
1 Joule

B
1 eV

C
1 Erg

D
1 Watt
Question 9
4 / -1

A body of mass 10 kg at rest is acted upon simultaneously by two forces 4 N and 3 N at right angles to each other. The kinetic energy of the body at the end of 10 sec is

A
100 J

B
300 J

C
50 J

D
125 J

Solution
Question 10
4 / -1

A man starts walking from a point on the surface of Earth (assumed smooth) and reaches diagonally opposite point. What is the work done by him?

A
Zero

B
Positive

C
Negative

D
Nothing can be said