Physics: Hardest Exam! Trivia Quiz

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

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

• 60°

• 30°

• 45°

• 90°

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)

• 5.0s

• 8.7s

• 10.0s

• 17.3s

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

• Bicycle

• Javelin

• Bullet

• Golf ball

Images formed by diverging lenses are always:

• Virtual, enlarged & inverted

• Virtual, diminished and inverted

• Virtual, diminished and erect

• Real, diminished and inverted.

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.

• 1

• 2

• 4

• 5

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.

• 6.6cm

• 11.1cm

• 13.3cm

• 26.6cm

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

• +20.0D

• 0.20D

• -0.20D

• -0.2D

A lens that is thinner at the middle and thicker at the edges is

• Diverging

• Converging

• Plano-convex

• Converging  meniscus

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

• Projector

•   Periscope

•   Microscope

•   Telephone

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:

• Less than f

•  Greater than 2f

• Equal to f

• Greater than f but less than 2f

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?

• 10cm

If f represents the principal focus of the objective lens of a compound microscope, the object to be viewed should be placed

• At f

• Between f and 2f

• At 2f

• Between f and the objective lens

An astronomical telescope with focal length of objective lens, f_o  and eye piece lens, f_e  is in normal adjustment when the final image is formed at infinity. This because

• F₀  >  f_e

• F₀  < f_e

• F₀ - f_e = distance between the two lenses

• F₀ + f_e = distance of the lenses

What part of the camera corresponds to the iris of the eye?

• The shutter

• The film

• The diaphragm

• The lens

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

• Short sight, converging lens

• Short sight diverging lens

• Long sight, converging lens

• Long sight, diverging lens

The ability of the eye to focus object at different distances is called:

• Power

•   Accommodation

• Normal vision

•  Persistence of vision

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

• Converging lens

• Diverging lens

•  periscope

• Microscope

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.

• 50cm

• 60cm

• 70cm

• 80cm

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

• Reflection

• Diffraction

• Dispersion

• Deviation

Primary colours of light are:

• Red, Yellow, Green

• Red, White, Orange

• Red, Blue, Indigo

• Red, Blue, Green.

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

• Red 

• Blue

• Black

• White

Dispersion of white light by a glass is due to the

• Defects in the glass

• Different speeds of various colours of light in the glass

• Density of the glass

• Colour of the glass

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

• Green

• Bluish green

• Yellow

• White

Sound wave cannot pass through

• Solids

• Liquids

• Vacuum

• Gases

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

• Air

• Water

• Wood

• Steel

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.

• 59.4 

• 82.5

• 270.0

• 330.0

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

• Air, water, iron 

• Iron, water, air

• Water, iron, air 

• Iron, water, air

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

• 0.005

• 0.02

• 0.5

• 2.

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

• The velocity increases 

• The pitch decreases 

• The strength increases 

• The loudness decreases.

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

• I only 

• II only

• I and II only 

• I,II and III only

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

• Piano

• Guitar

• Flute

• Talking Drum

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

• Pitch

• Speed

• Harmonics

• Loudness

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

• Beats

• Diffraction

• Overtones

• Resonance

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

• 4 nodes

• 5 nodes

• 3 antinodes

• 4 antinodes

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

• Resonance

• Echo

• Reverberation

• Diffraction

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.

• 509.4m/s

• 480.0m/s

• 339.6m/s

• 169.8m/s

1. 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

• Mechanical and transverse

• Stationary and longitudinal

• Progressive and longitudinal

• Stationary and transverse

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

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

Which of the following is a stringed instruments?

• Flute

• Trumplet

• Piano

• Saxophone

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.

• 3

• 6

• 150

• 300

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

• Thin and short

•  thick and short

• Thin and long

• Thick and long

If the fundamental frequency of a closed pipe is f_c  and that of an open is f₀  then

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.

• 4 ms^-1

• 9 ms^-1

• 12 ms^-1

• 16 ms^-1

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.

• 20N

• 80N

• 200N

• 800N

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?

• 12.5 ms^-1

• 10.0 ms^-1

• 7.5 ms^-1

• 2.0 ms^-1

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.

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

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

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

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