Tag: evs

Questions Related to evs

A machine language depends on the ....................... of a computer.

evs computer computer - an introduction computer and its functions different parts used in computers

  1. Hardware

  2. Software

  3. Both (a) and (b)

  4. None of these

Show answer
Correct Option: A

Kerosene floats on water because :

evs sorting materials into groups properties of materials grouping and classification of objects nature of things

  1. kerosene has more density

  2. kerosene has less energy

  3. densities of water and kerosene are equal

  4. water has more density

Show answer
Correct Option: D
Explanation:

Water is denser than kerosene. The density of water is $1000kg/m^3$ and kerosene is $810kg/m^3$

when something is less dense than the water then it floats on water. Thus kerosene floats on water.

Option D is correct.

The colour of a green leaf, when white light passing through a yellow filter is applied on it is:

evs light and shadow nature and sources of light how light travels path of light elementary ideas of astronomy

  1. black

  2. yellow

  3. red

  4. green

Show answer
Correct Option: A
Explanation:

A yellow filter allows only yellow colour to pass through it. A leaf looks green because leaf reflects green colour and absorbs the rest. Thus, the yellow light passing through the filter will be absorbed by the green leaf. Thus, no colour will be reflected by the leaf making it appear black.

The path along which light travels is called a ........

evs light and shadow nature and sources of light how light travels path of light elementary ideas of astronomy

  1. ray

  2. line

  3. line segment

  4. none

Show answer
Correct Option: A
Explanation:

The path along which light travels is called a Ray.

A beam of light gets reflected from a plane mirror and a real image is formed. The incident beam should be 

evs light and shadow nature and sources of light how light travels path of light elementary ideas of astronomy

  1. Parallel

  2. Convergent

  3. Divergent

  4. Plane mirror cannot form a real image

Show answer
Correct Option: B
Explanation:

  1. Plane mirrors don't usually form real images They form virtual images of real objects. However, things can be arranged so that a plane mirror does form a real image. A convergent light beam can do this. So the answer is "convergent"

  2. When at convergence point, a convergent beam of light is incident on the plane mirror, a real image is formed at the point

During reflection when light gets reflected form a surface 

evs light and shadow nature and sources of light how light travels path of light elementary ideas of astronomy

  1. it selects the path that takes the least time

  2. it selected the path that takes the maximum time

  3. it selects the shortest path

  4. none of these

Show answer
Correct Option: A
Explanation:

it selects the path that takes the least time.

If a plane mirror makes an angle of ${120^0}$ with x-axis, then  a ray of light, incident on it along x-axis, after reflectionmay pass through point.

evs light and shadow nature and sources of light how light travels path of light elementary ideas of astronomy

  1. (1,1)

  2. $\left( {1,\sqrt 3 } \right)$

  3. (3,1)

  4. (1,2)

Show answer
Correct Option: B

When red glass is heated in dark room, it will seem:

evs light and shadow nature and sources of light how light travels path of light elementary ideas of astronomy

  1. black

  2. purple

  3. green

  4. yellow

Show answer
Correct Option: C
Explanation:

When a red glass is heated to a high temperature it will glow with green light.

Light shows:

evs light and shadow nature and sources of light how light travels path of light elementary ideas of astronomy

  1. Curvilinear propagation

  2. Rectilinear propagation

  3. Random propagation

  4. None of the above

Show answer
Correct Option: B
Explanation:
Light shows Rectilinear propagation.
Rectilinear Propagation of Light is the tendency of light to travel in straight Lines.

We can see the objects only when:

evs light and shadow nature and sources of light how light travels path of light elementary ideas of astronomy

  1. reflected light from the objects reaches our eyes

  2. the objects absorb all the light

  3. when the objects allow all the light to pass through them

  4. none of the above

Show answer
Correct Option: A
Explanation:

Objects can pnly be seen when light falls onto the object and is reflected back to our eyes to form an image on the retina.