SAT - Science - Physics - Motion

Question - 1

A heavy object is lifted by a helicopter to a higher place. The helicopter is moving vertically upwards. The graph below shows the resultant force on the object as a function of time. The acceleration of the helicopter moving upwards.

• A Increases
• B decreases
• C stays constant
• D zero

Question - 2

A motorcycle accelerates uniformly from rest along a straight road, reaching a speed of 200 km/h after 10 s. At what stage during the motion does the bike's speedometer needle pass the 100 km/h mark?

• A halfway along the road
• B 5 seconds after starting
• C some time before 5 sec
• D some distance after the halfway mark

Question - 3

The v - t graph represents the motion of

• A a projectile projected.vertically upward
• B an electron in the H2 atom
• C a bullet fired horizontally from the top of a tower
• D a car with constant acceleration along a straight road.

Question - 4

The position-time graph for two objects A and B is shown in the figure. If VA and VB are the velocities of the objects A & B respectively. Then the correct option is

• A VA = VB
• B VA< VB
• C VA> VB
• D VA> VB upto certain time and after that VA < VB

Question - 5

A toy cyclist completes one round of a square track of side 2 m in 40 seconds. What will be the displacement at the end of 3 minutes?

• A Zero
• B 52 m
• C $2\sqrt { 2 }$ m
• D 16 m

Question - 6

If a ball is thrown vertically upwards with speed u, the distance covered during the last t seconds of its, ascent is

• A 1/2 gt2
• B ut
• C ut- 1/2 gt2
• D (u + gt)t

Question - 7

A car covers 1/3 distance with speed 20 km/hr and 2/3 with 60 km/hr. Average speed is

• A 16m
• B 10 m
• C 8 m
• D 12 m

Question - 8

When a ball is thrown up vertically with velocity V0 it reaches a maximum height of h. If one wishes to triple the maximum height then the ball should be thrown with velocity

• A 3/2 V0
• B $\sqrt { 3 }$ V0
• C 3  V0
• D 9  V0

Question - 9

A ball is thrown from height h and another from 2 h. The ratio of time taken by the two balls to reach ground is

• A $\sqrt { 2 } :1$
• B $1:\sqrt { 2 }$
• C 2:1
• D 1:2

Question - 10

A ball is released freely from the top of a building of height h. How long will it take for the ball to come down if h=80 m, g= 10 m/s2

• A 6 s
• B 8 s
• C 4 s
• D 2 s