Light Travels in Straight Line

Q.

Which of these are luminous: Sun, Earth or Moon?

Q.

What is the velocity of light through spacetime?

Q.

Give word for:

An object which does not emit light of its own.

Q. You look through pipes A, B, C, and D of different shapes to see a candle flame as shown in figure.

Through which pipe will you be able to see the candle flame clearly?

1. A
2. B
3. C
4. D

Q. The property of light travelling in a straight line is called the propagation of light.

1. rectilinear
2. elliptical
3. circular

Q.

Choose the correct options and fill in the blank:

Objects which emit their own light are known as _______ (luminous/non-luminous) objects.

Q.

The speed of light is maximum in

1. Vacuum.

2. Kerosene.

3. Diamond.

4. Water.

Q. A boy is trying to see the flame of a burning candle through a bent pipe but cannot see it. This is because:

1. Light bends along the pipe.
2. Light disappears.
3. Light travels in a straight line.
4. Light gets absorbed by the pipe.

Q.

Distinguish between luminous and non luminous object.

Q.

The speed of light is _______ ms^-1.

Q.

What is the speed of light in vacuum?

Q. Which of the following are properties of light?

1. Light is a form of energy.
2. Light travels in a straight line.
3. Light can travel through vacuum.
4. Light needs a medium to propagate.

Q. Arun looks through pipes A, B, C, and D of different shapes to see a candle flame as shown in figure.

Which pipe will he be able to see the candle flame clearly?

1. A
2. B
3. C
4. D

Q. On a bright sunny day, Shaunak observed the sun through a small hole made in a sheet of foil. The image obtained seemed to be upright. What could be the reason for this?

1. Sun is spherical in shape
2. Sun is a star
3. Sun provides light to Earth
4. Sun produces heat

Q.

The speed of light in air is 3 X 10¹⁰ m/s

1. True
2. False

Q.

Using a pinhole camera, the image of the following tree is captured.

How will the image look?

1. 
   

4. 
   

Q.

Light travels in ___________.

1. a circular path

2. a curved path

3. a straight line

4. a zig-zag path

Q.

Differentiate between luminous and non-luminous objects.

Q. Define the terms: a ray of light and a beam of light.

Q. What propagation of light defines its motion in a straight line?

1. Circular
2. Curvilinear
3. Elliptical
4. Rectilinear

Q. You look through pipes A, B, C, and D of different shapes to see a candle flame as shown in figure.

Through which pipe will you be able to see the candle flame clearly?

1. A
2. B
3. C
4. D

Q. What propagation of light defines its motion in a straight line?

1. Elliptical
2. Rectilinear
3. Curvilinear
4. Circular

Q. What do we mean by the rectilinear propagation of light?

1. Light travels in a straight line.
2. Light only travels in air.
3. Light travels in a curved line.
4. Light travels in a circular path.

Q. Speed of light in vacuum is _________kilometres per second.

1. 200000
2. 250000
3. 300000
4. 400000