# Physics: Hardest Exam! Trivia Quiz

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District5emis
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Quizzes Created: 3 | Total Attempts: 1,636
Questions: 70 | Attempts: 161

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• 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

D. 160m
Explanation
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• 2.

### The range of a projectile at Ó¨ to the horizontal with a velocity U is given by:

A.
Explanation
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• 3.

### For a projectile, the maximum range is obtained when the angle  of projectile is:

• A.

60°

• B.

30°

• C.

45°

• D.

90°

C. 45°
Explanation
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• 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

A. 5.0s
Explanation
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• 5.

### The following objects used in sports and warfare are considered as projectiles except:

• A.

Bicycle

• B.

Javelin

• C.

Bullet

• D.

Golf ball

A. Bicycle
Explanation
*##*Correct*##*Incorrect

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• 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.

C. Virtual, diminished and erect
Explanation
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• 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

B. 2
Explanation
*##*Correct*##*Incorrect

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• 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

D. 26.6cm
Explanation
*##*Correct*##*Incorrect

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• 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

A. +20.0D
Explanation
*##*Correct*##*Incorrect

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• 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

A. Diverging
Explanation
*##*Correct*##*Incorrect

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• 11.

### Which of the following optical instruments does not make use of a lens?

• A.

Projector

• B.

Periscope

• C.

Microscope

• D.

Telephone

B.   Periscope
Explanation
*##*Correct*##*Incorrect

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• 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

D. Greater than f but less than 2f
Explanation
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• 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.
B.
Explanation
*##*Correct*##*Incorrect

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• 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

B. Between f and 2f
Explanation
*##*Correct*##*Incorrect

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• 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

D. F0 + f= distance of the lenses
Explanation
*##*Correct*##*Incorrect

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• 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

C. The diaphragm
Explanation
*##*Correct*##*Incorrect

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• 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

B. Short sight diverging lens
Explanation
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• 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

B.   Accommodation
Explanation
*##*Correct*##*Incorrect

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• 19.

### For correcting long sight defects in the human eye, we require a

• A.

Converging lens

• B.

Diverging lens

• C.

periscope

• D.

Microscope

A. Converging lens
Explanation
*##*Correct*##*Incorrect

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• 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

A. 50cm
Explanation
*##*Correct*##*Incorrect

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• 21.

### When white light is passed through a glass prism, it is broken up into its component colours. This phenomenon is known as:

• A.

Reflection

• B.

Diffraction

• C.

Dispersion

• D.

Deviation

C. Dispersion
Explanation
*##*Correct*##*Incorrect

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• 22.

### Primary colours of light are:

• A.

Red, Yellow, Green

• B.

Red, White, Orange

• C.

Red, Blue, Indigo

• D.

Red, Blue, Green.

D. Red, Blue, Green.
Explanation
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• 23.

### A book which looks red in white light is viewed in magenta light. What colour does it appear?

• A.

Red

• B.

Blue

• C.

Black

• D.

White

A. Red
Explanation
*##*Correct*##*Incorrect

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• 24.

### Dispersion of white light by a glass is due to the

• A.

Defects in the glass

• B.

Different speeds of various colours of light in the glass

• C.

Density of the glass

• D.

Colour of the glass

B. Different speeds of various colours of light in the glass
Explanation
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• 25.

### The effect produced in the eye by a mixture of purple and green lights is

• A.

Green

• B.

Bluish green

• C.

Yellow

• D.

White

D. White
Explanation
*##*Correct*##*Incorrect

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• 26.

### Sound wave cannot pass through

• A.

Solids

• B.

Liquids

• C.

Vacuum

• D.

Gases

C. Vacuum
Explanation
*##*Correct*##*Incorrect

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• 27.

### In which of the following is the speed of sound greatest?

• A.

Air

• B.

Water

• C.

Wood

• D.

Steel

D. Steel
Explanation
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• 28.

### A man standing 99m from the foot of a tall cliff claps his hands and hears an echo 0.6s later. Calculate the velocity of sound in air in m/s.

• A.

59.4

• B.

82.5

• C.

270.0

• D.

330.0

D. 330.0
Explanation
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• 29.

### The speed of sound travelling in various media increases in the following correct order:

• A.

Air, water, iron

• B.

Iron, water, air

• C.

Water, iron, air

• D.

Iron, water, air

A. Air, water, iron
Explanation
*##*Correct*##*Incorrect

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• 30.

### A source of sound produces waves in air of wave length 65m. if the speed of sound in air is 330m/s, the period of vibration in second is

• A.

0.005

• B.

0.02

• C.

0.5

• D.

2.

A. 0.005
Explanation
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• 31.

### Which of the following statements about the frequency of a note is correct? As the frequency decreases,

• A.

The velocity increases

• B.

The pitch decreases

• C.

The strength increases

• D.

The loudness decreases.

B. The pitch decreases
Explanation
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• 32.

### Which of the following is/are characteristics of sound? I. Pitch   II. Loudness     III. Quality    IV. Noise

• A.

I only

• B.

II only

• C.

I and II only

• D.

I,II and III only

D. I,II and III only
Explanation
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• 33.

### Which of the following instruments produces sound by the vibration of air column?

• A.

Piano

• B.

Guitar

• C.

Flute

• D.

Talking Drum

C. Flute
Explanation
*##*Correct*##*Incorrect

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• 34.

### The factor which enables the ear to distinguish between a note played on different instruments is the

• A.

Pitch

• B.

Speed

• C.

Harmonics

• D.

Loudness

A. Pitch
Explanation
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• 35.

### When two notes of nearly equal frequencies are sounded together, a periodic rise and fall in sound intensity can be heard. This phenomenon is called

• A.

Beats

• B.

Diffraction

• C.

Overtones

• D.

Resonance

A. Beats
Explanation
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• 36.

### Which of the following statements about the 3rd overtones of a vibrating air column of an open pipe is correct? It has

• A.

4 nodes

• B.

5 nodes

• C.

3 antinodes

• D.

4 antinodes

A. 4 nodes
Explanation
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• 37.

### Loudness increases as a vibrating tuning fork is brought nearer the end of a pipe containing air column due to

• A.

Resonance

• B.

Echo

• C.

Reverberation

• D.

Diffraction

A. Resonance
Explanation
*##*Correct*##*Correct

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• 38.

### A tuning fork of frequency 600HZ is sounded over a closed resonance tube. If the first and second resonant positions are 0.130m and 0.413m respectively. Calculate the speed of sound in air.

• A.

509.4m/s

• B.

480.0m/s

• C.

339.6m/s

• D.

169.8m/s

D. 169.8m/s
Explanation
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• 39.

### The air column in a resonance tube is set into resonance by a vibrating tuning fork. The resultant waves in the air column will be

• A.

Mechanical and transverse

• B.

Stationary and longitudinal

• C.

Progressive and longitudinal

• D.

Stationary and transverse

B. Stationary and longitudinal
Explanation
*##*Correct*##*Incorrect

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• 40.

### A pipe open at both ends, produces a fundamental note. If the velocity of sound in air is V and Æ–, the length of the pipe. Which of the following expresses the frequency of the note? (Neglect end – correction).

B.
Explanation
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• 41.

### The distance between a node and an antinode for a transverse wave produced by a string is:

D.
Explanation
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• 42.

### Which of the following is a stringed instruments?

• A.

Flute

• B.

Trumplet

• C.

Piano

• D.

Saxophone

C. Piano
Explanation
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• 43.

### A string is stretched tightly between two points 50cm apart. It is plucked at its centre and the velocity of the wave produced is 300m/s. Calculate the number of vibrations made by the string in one second.

• A.

3

• B.

6

• C.

150

• D.

300

D. 300
Explanation
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• 44.

### In a stringed instrument like a guitar or violin, high pitched notes are produced by strings that are:

• A.

Thin and short

• B.

thick and short

• C.

Thin and long

• D.

Thick and long

A. Thin and short
Explanation
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• 45.

### If the fundamental frequency of a closed pipe is fc  and that of an open isf0  then

B.
Explanation
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• 46.

### A body of mass 80kg moving with a velocity of 6ms-1 hits a stationary body of mass 40kg. If the two bodies stick together after the collision, calculate the magnitude of the velocity with which they move.

• A.

4 ms-1

• B.

9 ms-1

• C.

12 ms-1

• D.

16 ms-1

A. 4 ms-1
Explanation
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• 47.

### Fuel was consumed at a steady rate of 5.0 x 10-2 kg per second in a rocket engine and ejected as a gas with a speed of 4 x 103ms-1 . Determine the thrust on the rocket.

• A.

20N

• B.

80N

• C.

200N

• D.

800N

D. 800N
Explanation
*##*Correct*##*Incorrect

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• 48.

### A body loses X two-fifth of its velocity when it makes a head-on collision with an identical body Y at rest. After the collision Y moves on with a speed of 4ms-1 in the original direction of X. What is the magnitude of the velocity of X before the collision?

• A.

12.5 ms-1

• B.

10.0 ms-1

• C.

7.5 ms-1

• D.

2.0 ms-1

B. 10.0 ms-1
Explanation
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• 49.

### An object of mass of 2kg moving with a velocity of 3ms-1 collides head-on with another object of mass 1kg moving in the opposite direction with a velocity of 4ms-1. If the objects stick together after collision, calculate their common speed.

• A.

0.60 ms<sup style="color: rgb(102, 102, 102); font-weight: inherit;">-1

• B.

0.67 ms<sup style="color: rgb(102, 102, 102); font-weight: inherit;">-1

• C.

2.00 ms<sup style="color: rgb(102, 102, 102); font-weight: inherit;">-1

• D.

3.33 ms<sup style="color: rgb(102, 102, 102); font-weight: inherit;">-1

B. 0.67 ms<sup style="color: rgb(102, 102, 102); font-weight: inherit;">-1
Explanation
*##*Correct*##*Incorrect

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• 50.

### A constant force acts on a body of mass 50kg and reduces the speed from 90ms-1 to 20ms-1 in 20s. Calculate the magnitude of the force.

• A.

3500N

• B.

175N

• C.

875N

• D.

350N

B. 175N
Explanation
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• Current Version
• Mar 21, 2023
Quiz Edited by
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• Sep 22, 2020
Quiz Created by
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