June 10, 2021 |

PPSC Lecturer of Physics Online Test 50 Solved MCQs

Online Free Taleem is free online MCQ’s test related to Lecturer Physics. All the individuals who are going to appear in Lecturer Physics written test can attempt these tests in order to prepare for it in best possible way. Our tests of Lecturer of Physics include all the important questions and Past Paper of Lecturer Physics, that have extremely high amount of chances for been included in the actual exam which make our test undoubtedly the best source of preparation.

Note:-

There will be 25 multiple choice question in the test.
Answer of the questions will change randomly each time you start this test.
Practice this test at least 5 times if you want to secure High Marks.
At the End of the Test you can see your Test score and Rating.
If you found any incorrect answer in Quiz. Simply click on the quiz title and comment below on that MCQ. So that I can update the incorrect answer on time.

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Test Instructions:-
Test Name	Lecturer Physics
Subject	Physics Test 50
Test Type	MCQs
Total Questions	25
Total Time	20 Minutes
Total Marks	100

You have 20 minutes to pass to the quiz.

PPSC LECTURER OF PHYSICS TEST NO. 50

1 / 25

A brick slides on a horizontal surface. Which of the following will increase the magnitude of the frictional force on it?

Increasing the surface area of contact

Decreasing the surface area of contact

Decreasing the mass of the brick

Putting a second brick on top

None of the above

2 / 25

A horizontal shove of at least 200N is required to start moving a 800-N crate initially at rest on a horizontal floor. The coefficient of static friction is:

none of these

0.50

0.125

4.00

0.25

3 / 25

A bureau rests on a rough horizontal surface (μs = 0.50, μk = 0.40). A constant horizontal force, just sufficient to start the bureau in motion, is then applied. The acceleration of the bureau is:

3.3m/s2

8.9m/s2

0.98m/s2

4.5m/s2

4 / 25

The speed of a 4.0-N hockey puck, sliding across a level ice surface, decreases at the rate of 0.61m/s2. The coefficient of kinetic friction between the puck and ice is:

0.062

0.41

9.8

0.62

1.2

5 / 25

A massless rope passes over a massless pulley suspended from the ceiling. A 4-kg block is attached to one end and a 5-kg block is attached to the other end. The acceleration of the 5-kg block is:

g/9

4g/9

g/4

5g/9

g/5

6 / 25

A 13-N weight and a 12-N weight are connected by a massless string over a massless, frictionless pulley. The 13-N weight has a downward acceleration with magnitude equal to that of a freely falling body times:

1/13

1/25

1/12

13/25

7 / 25

A car is traveling at 15m/s on a horizontal road. The brakes are applied and the car skids to a stop in 4.0 s. The coefficient of kinetic friction between the tires and road is:

0.38

0.69

0.76

1.11

0.92

8 / 25

A crate is sliding down an incline that is 35◦ above the horizontal. If the coefficient of kinetic friction is 0.40, the acceleration of the crate is:

10.3m/s2

5.8m/s2

8.8m/s2

2.4m/s2

9 / 25

A crate resting on a rough horizontal floor is to be moved horizontally. The coefficient of static friction is 0.40. To start the crate moving with the weakest possible applied force, in what direction should the force be applied?

24◦ below the horizontal

22◦ above the horizontal

Horizontal

24◦ above the horizontal

66◦ below the horizontal

10 / 25

A block is placed on a rough wooden plane. It is found that when the plane is tilted 30◦ to the horizontal, the block will slide down at constant speed. The coefficient of kinetic friction of the block with the plane is:

1.73

4.90

0.866

0.577

0.500

11 / 25

A short 10-g string is used to pull a 50-g toy across a frictionless horizontal surface. If av3.0 × 10−2-N force is applied horizontally to the free end, the force of the string on the toy, at the other end, is:

3.0 × 10−2 N

6.0 × 10−3 N

2.5 × 10−2 N

3.5 × 10−2 N

0.15N

12 / 25

A horizontal force of 12N pushes a 0.5-kg book against a vertical wall. The book is initially at rest. If the coefficients of friction are μs = 0.6 and μk = 0.8 which of the following is true?

The book will start moving and accelerate

If started moving downward, the book will decelerate

The magnitude of the frictional force is 4.9N

The magnitude of the frictional force is 7.2N

The normal force is 4.9N

13 / 25

A horizontal force of 5.0N pushes a 0.50-kg block against a vertical wall. The block is initially at rest. If μs = 0.60 and μk = 0.80, the acceleration of the block in m/s2 is:

1.8

9.8

8.0

6.0

14 / 25

The coefficient of kinetic friction:

is in the direction of the normal force

is the ratio of force to area

can have units of newtons

is in the direction of the frictional force

is none of the above

15 / 25

A 50-N force is applied to a crate on a horizontal rough floor, causing it to move horizontally. If the coefficient of kinetic friction is 0.50, in what direction should the force be applied to obtain the greatest acceleration?

27◦ above the horizontal

30◦ below the horizontal

60◦ above the horizontal

Horizontal

30◦ above the horizontal

16 / 25

A 40-N crate rests on a rough horizontal floor. A 12-N horizontal force is then applied to it. If the coefficients of friction are μs = 0.5 and μk = 0.4, the magnitude of the frictional force on the crate is:

16N

20N

40N

12N

17 / 25

A 5.0-kg crate is resting on a horizontal plank. The coefficient of static friction is 0.50 and the coefficient of kinetic friction is 0.40. After one end of the plank is raised so the plank makes an angle of 25◦ with the horizontal, the force of friction is:

44N

22N

18N

21N

18 / 25

A box rests on a rough board 10 meters long. When one end of the board is slowly raised to a height of 6 meters above the other end, the box begins to slide. The coefficient of static friction is:

0.6

0.4

0.25

0.8

0.75

19 / 25

A forward horizontal force of 12N is used to pull a 240-N crate at constant velocity across a horizontal floor. The coefficient of friction is:

0.2

0.05

0.5

20 / 25

A 12-kg crate rests on a horizontal surface and a boy pulls on it with a force that is 30◦ below the horizontal. If the coefficient of static friction is 0.40, the minimum magnitude force he needs to start the crate moving is:

54N

71N

47N

44N

56N

21 / 25

A horizontal force of 5.0N pushes a 0.50-kg book against a vertical wall. The book is initially at rest. If the coefficients of friction are μs = 0.6 and μk = 0.80, the magnitude of the frictional force is:

5.0N

4.9N

3.0N

4.0N

22 / 25

When the brakes of an automobile are applied, the road exerts the greatest retarding force:

while the wheels are sliding

at the instant when the speed begins to change

when the acceleration is least

when the automobile is going fastest

just before the wheels start to slide

23 / 25

A professor holds an eraser against a vertical chalkboard by pushing horizontally on it. He pushes with a force that is much greater than is required to hold the eraser. The force of friction exerted by the board on the eraser increases if he:

pushes with slightly less force

pushes with slightly greater force

pushes so his force is slightly downward but has the same magnitude

pushes so his force is slightly upward but has the same magnitude

stops pushing

24 / 25

A 24-N horizontal force is applied to a 40-N block initially at rest on a rough horizontal surface. If the coefficients of friction are μs = 0.5 and μk = 0.4, the magnitude of the frictional force on the block is:

20N

400N

12N

16N

25 / 25

A horizontal force of 12N pushes a 0.50-kg book against a vertical wall. The book is initially at rest. If μs = 0.6 and μk = 0.80, the acceleration of the book in m/s2 is:

9.4m/s2

19.2m/s2

9.8m/s2

14.4m/s2

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