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NSO

Description: Motion and measurement, Light
Number of Questions: 15
Created by:
Tags: Motion Measurement of Distance Light Motion and Force Motion in One Dimension Force Light
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Which of the following is not an arbitrary unit of measurement?

  1. Hand span

  2. Foot length

  3. A ruler

  4. Arms length

  5. Finger length

Show answer
Correct Option: C
Explanation:

No, ruler is a standard unit of measurement. Hence, it is the correct answer.

Invention of wheel led to a drastic change in which field?

  1. Time

  2. Measurement

  3. Transport

  4. Software

  5. All of these

Show answer
Correct Option: C
Explanation:

Yes, invention of wheel led to a change in field of transport.

Which of the following does not show periodic type of motion?

  1. Wheel of cycle

  2. Sewing machine's needle

  3. Pendulum of a big clock

  4. A child swinging

  5. None of these

Show answer
Correct Option: A
Explanation:

No, it is not a periodic motion. Hence, it is the correct answer.

Which of the following types of motion is shown by a truck moving on a bend?

  1. Linear

  2. Curvilinear

  3. Rotation

  4. Periodic

  5. Circular

Show answer
Correct Option: B
Explanation:

Yes, it the correct answer. When the motion is on a curved path, it is called curvilinear motion.

Which of the following objects is/are known as luminous object(s)? (a) Sun (b) Moon (c) Bulb (d) Glass (e) Mirror

  1. Both a and c

  2. Both a and b

  3. Both d and e

  4. Both c and e

  5. Both b and e

Show answer
Correct Option: A
Explanation:

Yes, it is correct. Sun and bulb have their own light.

Which is false regarding the correct steps of measurement?

  1. The scale should be placed along the length of the object to be measured.

  2. The zero mark of the scale should be taken as the beginning point.

  3. Marking of the scale should be clear and visible.

  4. The eye position should be just above the point to be measured.

  5. None of these

Show answer
Correct Option: E
Explanation:

Yes, it is the correct answer as all are correct.

Sri is holding a mirror in a complete dark room. What kind of image will he see?

  1. Dark coloured image

  2. Inverse image

  3. Diminished image

  4. Exactly same image

  5. None of these

Show answer
Correct Option: E
Explanation:

Yes, it is the correct answer. It is not possible to see the reflection in a mirror in a completely dark room. We need light to see anything.

When an object is close to the source of light, the shadow formed will _____________.

  1. be long and at the back of object

  2. be short and at the back of object

  3. not be formed

  4. be long and on the same side

  5. be short and on the same side

Show answer
Correct Option: A
Explanation:

Yes, if the source of light is closer to the object, a larger shadow is formed at the back of the object.

Which of the following objects will cast a clear dark shadow?

  1. A glass container

  2. Translucent door

  3. Wooden chair

  4. Eye lens

  5. All of these

Show answer
Correct Option: C
Explanation:

Yes, it is correct as no light will pass through it. When light falls on an opaque object, a dark patch is formed on the other side of the object.

Manohar could see a clear image of the tree in the water, as the water was still. Which option explains it correctly?

  1. It is because of reflection.

  2. It is because of refraction.

  3. It is because of shadow formed in water.

  4. It is because of transparency of water.

  5. None of these

Show answer
Correct Option: A
Explanation:

Yes, it is the correct answer. Image is seen as the surface of water acts as a reflecting medium.

Parallax error during measurement is due to ___________.

  1. incorrect object position

  2. incorrect eye position

  3. incorrect ruler position

  4. not proper light

  5. all of these

Show answer
Correct Option: B
Explanation:

Yes, it is the correct answer. The eye position should be just above the point to be measured. Incorrect eye position leads to parallax error and gives incorrect reading.

In a pinhole camera, one can get _____________ image.

  1. inverted and virtual

  2. erect and virtual

  3. inverted and real

  4. erect and real

  5. enlarged

Show answer
Correct Option: C
Explanation:

Yes, it is correct. A pinhole camera is simple device. One can get an inverted and real image in a pinhole camera.

An object which produces light by itself is ___________.

  1. non-luminous object

  2. luminous object

  3. transparent object

  4. translucent object

  5. opaque object

Show answer
Correct Option: B
Explanation:

Yes, it is correct. An object which produces light is called a luminous object.

On a stormy night, Ramesh could see a faint image of tree branches through the window pane. What kind of a window pane does his room have?

  1. Transparent

  2. Opaque

  3. Translucent

  4. Dirty glass

  5. Pane with reflecting surface

Show answer
Correct Option: C
Explanation:

Yes, Ramesh could see a faint image as partial light can pass through translucent window pane.

Which of the following statements is/are true?

(a) The smaller the angle of incidence, the larger is the shadow formed. (b) The nearer the source of light, the smaller is the shadow formed. (c) When source of light is on top of a gas cylinder, a circular shadow will be formed.

  1. Only c

  2. Only b

  3. Only a

  4. Both a and c

  5. All are true

Show answer
Correct Option: D
Explanation:

Yes, if the source of light is closer to the object, a larger shadow is formed than when the source of light is far from the object. The shadow of any cylindrical object will be a circle, when source of light is at the top.

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