# Physics: Hardest Exam! Trivia Quiz

20 Questions | Total Attempts: 104  Settings  .

• 1.
A ball is projected horizontally from the top of a hill with a velocity of 20m/s. If it reaches the ground 4seconds later, what is the height of the hill?
• A.

20m

• B.

40m

• C.

80m

• D.

160m

• 2.
The range of a projectile at Ө to the horizontal with a velocity U is given by:
• A.
• B.
• C.
• D.
• 3.
For a projectile, the maximum range is obtained when the angle  of projectile is:
• A.

60°

• B.

30°

• C.

45°

• D.

90°

• 4.
An object is projected with a velocity of 100m/s at an angle of 60° to the vertical. Calculate the time taken by the object to reach the highest point. (Take gas 10m/s²)
• A.

5.0s

• B.

8.7s

• C.

10.0s

• D.

17.3s

• 5.
The following objects used in sports and warfare are considered as projectiles except:
• A.

Bicycle

• B.

Javelin

• C.

Bullet

• D.

Golf ball

• 6.
Images formed by diverging lenses are always:
• A.

Virtual, enlarged & inverted

• B.

Virtual, diminished and inverted

• C.

Virtual, diminished and erect

• D.

Real, diminished and inverted.

• 7.
An object 1cm high is placed in front of a converging lens at a distance of  7.5cm from the lens. If the focal length of the lens is 15cm, find the magnification.
• A.

1

• B.

2

• C.

4

• D.

5

• 8.
A converging lens of focal length 10cm forms an erect image three times the size of a real object. Calculate the distance between the object and the image.
• A.

6.6cm

• B.

11.1cm

• C.

13.3cm

• D.

26.6cm

• 9.
A converging lens has a focal length of 5cm. Determine its power.
• A.

+20.0D

• B.

0.20D

• C.

-0.20D

• D.

-0.2D

• 10.
A lens that is thinner at the middle and thicker at the edges is
• A.

Diverging

• B.

Converging

• C.

Plano-convex

• D.

Converging  meniscus

• 11.
Which of the following optical instruments does not make use of a lens?
• A.

Projector

• B.

Periscope

• C.

Microscope

• D.

Telephone

• 12.
At which of the following distances from the lens should a slide be placed in a slide projector if f is the focal length of the projection lens:
• A.

Less than f

• B.

Greater than 2f

• C.

Equal to f

• D.

Greater than f but less than 2f

• 13.
A simple microscope forms an image three times the size of the object. If the focal length of the lens of the microscope is 10cm, how far is the object from the lens?
• A.
• B.
• C.

10cm

• D.
• 14.
If f represents the principal focus of the objective lens of a compound microscope, the object to be viewed should be placed
• A.

At f

• B.

Between f and 2f

• C.

At 2f

• D.

Between f and the objective lens

• 15.
An astronomical telescope with focal length of objective lens, fo  and eye piece lens, fe  is in normal adjustment when the final image is formed at infinity. This because
• A.

F0  >  fe

• B.

F0  < fe

• C.

F- f= distance between the two lenses

• D.

F0 + f= distance of the lenses

• 16.
What part of the camera corresponds to the iris of the eye?
• A.

The shutter

• B.

The film

• C.

The diaphragm

• D.

The lens

• 17.
Image of a distant object is focused before the retina. What defect is this and with what type of lens can it be corrected?
• A.

Short sight, converging lens

• B.

Short sight diverging lens

• C.

Long sight, converging lens

• D.

Long sight, diverging lens

• 18.
The ability of the eye to focus object at different distances is called:
• A.

Power

• B.

Accommodation

• C.

Normal vision

• D.

Persistence of vision

• 19.
For correcting long sight defects in the human eye, we require a
• A.

Converging lens

• B.

Diverging lens

• C.

periscope

• D.

Microscope

• 20.
Find the focal length of the lens required to correct the defect of vision of a man whose near point is 50cm. Assume the least distance of vision of the normal eye to be 25cm.
• A.

50cm

• B.

60cm

• C.

70cm

• D.

80cm

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