Laws of Motion Test

Result

Laws of Motion Test - 68

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Weekly Quiz Competition

Question 1
4 / -1

The mass of a lift is 2000 kg. When the tension in the supporting cable is 28000 N, then its acceleration is

A
30 ms^–2 downwards

B
4 ms^–2 upwards

C
4 ms^–2 downwards

D
14 ms^–2 upwards

Solution
Question 2
4 / -1

Formula for true force is

A

B

C

D
Question 3
4 / -1

A 10 kg stone is suspended with a rope of breaking strength 30 kg wt. The minimum time in which the stone can be raised through a height 10 m starting from rest is (taking g = 10 N/kg)

A
0.5 s

B
1.0 s

C

D
2.0 s

Solution
Question 4
4 / -1

A reference frame attached to the earth

A
Is an inertial frame by definition

B
Cannot be an inertial frame because earth is revolving round the sun

C
Is an inertial frame because Newton's laws are applicable

D
Is an inertial frame because the earth is rotating about its own axis
Question 5
4 / -1

A
10 m/s, towards east

B
10 m/s, towards north

C
10 m/s, towards south

D
10 m/s, towards north-east

Solution
Question 6
4 / -1

A force of 5 N acts on a body of weight 9.8 N. What is the acceleration produced in m/sec²?

A
49.00

B
5.00

C
1.46

D
0.51

Solution
Question 7
4 / -1

The engine of a car produces acceleration 4 m/s 2 in the car. If this car pulls another car of same mass, what will be the acceleration produced?

A
8 m/s²

B
2 m/s²

C
4 m/s²

D
1/2 m/s²

Solution
Question 8
4 / -1

A lift is going up. The total mass of the lift and the passenger is 1500 kg. The variation in the speed of the lift is as given in the graph. The tension in the rope pulling the lift at t =11^th sec will be

A
17400 N

B
14700 N

C
12000 N

D
Zero

Solution
Question 9
4 / -1

In the above question, the height to which the lift takes the passenger is

A
3.6 metres

B
8 metres

C
1.8 metres

D
36 metres

Solution
Question 10
4 / -1

A body of mass 5 kg is suspended by a spring balance on an inclined plane as shown in figure. The spring balance measure

A
50 N

B
25 N

C
500 N

D
10 N

Solution