# PPSC Lecturer of Physics Online Test 47 Solved MCQs

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There will be 25 multiple choice question in the test.
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 Test Instructions:- Test Name Lecturer PhysicsÂ Subject Physics Test 47 Test Type MCQs Total Questions 25 Total Time 20 Minutes Total Marks 100
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You have 20 minutes to pass to the quiz.

PPSC LECTURER OF PHYSICS TEST NO. 47

1 / 25

For a biological sample in a 1.0-m radius centrifuge to have a centripetal acceleration of 25g its speed must be:

2 / 25

Which of the following quantities is NOT a vector?

3 / 25

An example of an inertial reference frame is:

4 / 25

A car rounds a 20-m radius curve at 10m/s. The magnitude of its acceleration is:

5 / 25

An object moving at constant velocity in an inertial frame must:

6 / 25

Two objects are traveling around different circular orbits with constant speed. They both have the same acceleration but object A is traveling twice as fast as object B. The orbit radius for object A is...................... the orbit radius for object B.

7 / 25

An airplane is flying north at 500 km/h. It makes a gradual 180â—¦ turn at constant speed, changing its direction of travel from north through east to south. The process takes 40 s. The average acceleration of the plane for this turn (in km/hÂ·s) is:

8 / 25

A stone is tied to a 0.50-m string and whirled at a constant speed of 4.0m/s in a vertical circle. Its acceleration at the top of the circle is:

9 / 25

A force of 1N is:

10 / 25

A projectile is fired from ground level over level ground with an initial velocity that has a vertical component of 20m/s and a horizontal component of 30m/s. Using g = 10m/s2, the distance from launching to landing points is:

11 / 25

A stone is tied to a string and whirled at constant speed in a horizontal circle. The speed is then doubled without changing the length of the string. Afterward the magnitude of the acceleration of the stone is:

12 / 25

A motor boat can travel at 10 km/h in still water. A river flows at 5 km/h west. A boater wishes to cross from the south bank to a point directly opposite on the north bank. At what angle must the boat be headed?

13 / 25

An airplane makes a gradual 90â—¦ turn while flying at a constant speed of 200m/s. The process takes 20.0 seconds to complete. For this turn the magnitude of the average acceleration of the plane is:

14 / 25

A ferry boat is sailing at 12km/h 30â—¦ W of N with respect to a river that is flowing at 6.0km/h E. As observed from the shore, the ferry boat is sailing:

15 / 25

A boat is traveling upstream at 14km/h with respect to a river that is flowing at 6 km/h (with respect to the ground). A man runs directly across the boat, from one side to the other, at 6km/h (with respect to the boat). The speed of the man with respect to the ground is:

16 / 25

Two projectiles are in flight at the same time. The acceleration of one relative to the other:

17 / 25

A Ferris wheel with a radius of 8.0m makes 1 revolution every 10 s. When a passenger is at the top, essentially a diameter above the ground, he releases a ball. How far from the point on the ground directly under the release point does the ball land?

18 / 25

A stone is tied to a 0.50-m string and whirled at a constant speed of 4.0m/s in a vertical circle. Its acceleration at the bottom of the circle is:

19 / 25

A stone is tied to the end of a string and is swung with constant speed around a horizontal circle with a radius of 1.5m. If it makes two complete revolutions each second, the magnitude of its acceleration is:

20 / 25

The unit of force called the newton is:

21 / 25

In SI units a force is numerically equal to the.............. , when the force is applied to it.

22 / 25

A particle moves at constant speed in a circular path. The instantaneous velocity and instantaneous acceleration vectors are:

23 / 25

A newton is the force:

24 / 25

A girl jogs around a horizontal circle with a constant speed. She travels one fourth of a revolution, a distance of 25m along the circumference of the circle, in 5.0 s. The magnitude of her acceleration is:

25 / 25

A boat is able to move through still water at 20m/s. It makes a round trip to a town 3.0 km upstream. If the river flows at 5m/s, the time required for this round trip is: