Read important **Physics** MCQS For Exam.These **physics** General Knowledge Mcqs Contain of World Geography, Atmosphere, Science & Literature, events Mcqs, Current Affairs Mcqs , Pakistan Affairs Mcqs and International Organizations. These general knowledge questions are very important for all type of exams conducted by Fpsc, Nts, Kppsc, Ppsc, Spsc, Bpsc, Ots, Uts, Pts, Cts, Ats, etea and other testing agencies of Pakistan.

**Note:** The bold option is the right answer for the given MCQ’S:

**1. **An airplane makes a gradual 90◦ turn while flying at a constant speed of 200 m/s. The process

takes 20.0 seconds to complete. For this turn the magnitude of the average acceleration of the

plane is:

A. zero

B. 40 m/s

C. 20 m/s

**D. 14 m/s**

E. 10 m/s

**2. **An airplane is flying north at 500 km/h. It makes a gradual 180◦ 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/h·s) is:

A. 12.5 km/h · s, north

B. 12.5 km/h · s, east

C. 12.5 km/h · s, south

D. 25 km/h · s, north

**E. 25 km/h · s, south**

ans: E

**3. **An object is moving on a circular path of radius π meters at a constant speed of 4.0 m/s. The

time required for one revolution is:

A. 2/π2 s

**B. π2/2 s**

C. π/2 s

D. π2/4

E. 2/π s

**4. **A particle moves at constant speed in a circular path. The instantaneous velocity and instan-

taneous acceleration vectors are:

A. both tangent to the circular path

B. both perpendicular to the circular path

**C. perpendicular to each other**

D. opposite to each other

E. none of the above

**5. **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:

A. the same

B. twice as great

**C. four times as great**

D. half as great

E. one-fourth as great

**6. **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.

A. one-fourth

B. one-half

C. the same as

D. twice

**E. four times**

**7.** A stone is tied to a 0.50-m string and whirled at a constant speed of 4.0 m/s in a vertical circle.

Its acceleration at the top of the circle is:

A. 9.8 m/s, up

B. 9.8 m/s, down

C. 8.0 m/s, down

D. 32 m/s, up

**E. 32 m/s, down**

**8. **A stone is tied to a 0.50-m string and whirled at a constant speed of 4.0 m/s in a vertical circle.

Its acceleration at the bottom of the circle is:

A. 9.8 m/s, up

B. 9.8 m/s, down

C. 8.0 m/s, up

**D. 32 m/s, up**

E. 32 m/s, down

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

A. 0

B. 0.20 m/s

**C. 5.0 m/s**

D. 40 m/s

E. 400 m/s

**10. **For a biological sample in a 1.0-m radius centrifuge to have a centripetal acceleration of 25g

its speed must be:

A. 11 m/s

**B. 16 m/s**

C. 50 m/s

D. 122 m/s

E. 245 m/s

**11. **A girl jogs around a horizontal circle with a constant speed. She travels one fourth of a

revolution, a distance of 25 m along the circumference of the circle, in 5.0 s. The magnitude of

her acceleration is:

A. 0.31 m/s

B. 1.3 m/s

**C. 1.6 m/s**

D. 3.9 m/s

E. 6.3 m/s

**12. **A stone is tied to the end of a string and is swung with constant speed around a horizontal

circle with a radius of 1.5 m. If it makes two complete revolutions each second, the magnitude

of its acceleration is:

A. 0.24 m/s

B. 2.4 m/s

C. 24 m/s

**D. 240 m/s**

**13.** A Ferris wheel with a radius of 8.0 m 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?

A. 0

B. 1.0 m

C. 8.0 m

**D. 9.1 m**

E. 16 m

**14. **A boat is able to move through still water at 20 m/s. It makes a round trip to a town 3.0 km

upstream. If the river flows at 5 m/s, the time required for this round trip is:

A. 120 s

B. 150 s

C. 200 s

D. 300 s

**E. 320 s**

**15. **A boat is traveling upstream at 14 km/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

6 km/h (with respect to the boat). The speed of the man with respect to the ground is:

**A. 10 km/h**

B. 14 km/h

C. 18.5 km/h

D. 21 km/h

E. 26 km/h

**16. **A ferry boat is sailing at 12 km/h 30◦ W of N with respect to a river that is flowing at 6.0 km/h

E. As observed from the shore, the ferry boat is sailing:

A. 30◦ E of N

**B. due N**

C. 30◦ W of N

D. 45◦ E of N

E. none of these

**17. **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?

A. 27◦ E of N

**B. 30◦ E of N**

C. 45◦ E of N

D. 60◦ E of N

E. depends on the width of the river

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

A. is always 9.8 m/s

B. can be as large as 19.8 m/s

C. can be horizontal

**D. is zero**

E. none of these

**19. An example of an inertial reference frame is:**

A. any reference frame that is not accelerating

**B. a frame attached to a particle on which there are no forces**

C. any reference frame that is at rest

D. a reference frame attached to the center of the universe

E. a reference frame attached to Earth

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

A. have a net force on it

B. eventually stop due to gravity

C. not have any force of gravity on it

**D. have zero net force on it**

E. have no frictional force on it

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