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Tarun got to know that the next nearest star to us is Alpha Centauri and is at a distance of 4 light years from the Earth. What does it mean?

Question 9

You are provided three scales A, B and C as shown in Fig. to measure a length of 10 cm.

For the correct measurement of the length, you will use the scale,

(a) A only

(b) B only

(c) C only

(d) Any of three scales

The history of length

Select the correct statement.

People cast a shadow on the ground as they walk because they block:

1.64 m = ___ cm

Choose among the following which is/are complex machines ?

In a simple circuit, why does the bulb stop glowing when we open the switch

Question 4
The bulb in the circuit shown in the figure does not glow. Can you identify the problem? Make necessary changes in the circuit to make the bulb glow.

Explain why the mechanical advantage of the class III lever is always less than 1.

During a lunar eclipse colour of moon becomes

A boy is pushing a box kept on a table with his hand. What type of force is he applying on the box?

define instantaneous speed

Which of the following object(s) is luminous?

The force between two charged particles due to their charges is called _________

Why is a gap left between the race in railway track

Question 9

Fig. shows a bulb with its different parts marked as 1, 2, 3, 4 and 5. Which of them label the terminals of the bulb?

Q92) The Union Cabinet gave its approval for the maiden National Offshore Wind Energy Policy. Consider the following statements related to it.

1) The focus of the policy is to harness offshore wind energy potential in India’s Exclusive Economic Zone (EEZ), the EEZ is an area up to 200 nautical miles from the coast.

2) The National Institute of Wind Energy (NIWE) is the nodal ministry for the implementation of the policy

3) The Ministry of New & Renewable Energy (MNRE) is the nodal agency for execution of offshore wind energy projects.

4) The policy will be applicable throughout the country depending upon offshore wind potential availability.

Which of the statement(s) given above is/are correct?

Definition of static friction.

Cause: There has been incessant rain during the last 48 hours

Which of the following can be a possible effect for the cause mentioned above?

I. Transport system of the city has completely failed from last 48 hours.

II. There is flood like situation in most down town areas of the city.

III. So many slum dwellers have been shifted to municipal schools.

A mirror is an example of a/an _________object.

In which motion are we?

Which of the following are examples of non-uniform motion?

A block and tackle system of 5 pulleys consist of 3 pulleys in the upper block and 2 pulleys in the lower block. If the load is raised by 1 m, through what distance will effort move?

Non luminous object do not emit any light of their own. How is it still possible that we are able to see them

Question 1

Observe the picture given in Fig. carefully.

A patch of light is obtained at B, when the torch is lighted as shown. Which of the following is kept at position A to get this patch of light?

(a) A wooden board

(b) A glass sheet

(c) A mirror

(d) A sheet of white paper

If a bar magnet is brought closer to another bar magnet's head. It was observed that they repel each other. What are the poles of part 1 and part 2?

Question 11

A toy car has a bar magnet laid hidden inside its body along its length. Using another magnet how will you find out which pole of the magnet is facing the front of the car?

Select the correct alternative :

(a) The speed of light in air or vacuum is :

(i) $3\times {10}^{8}m{s}^{}-1$

(ii $2.25\times {10}^{8}m{s}^{-1}$

(iii) $3.32m{s}^{-1}$

(iv) $2.0\times {10}^{8}m{s}^{-1}$

(b) A ray of light moving from an optically rarer to a denser medium :

(i) bends away from the normal

(ii) bends towards the normal

(iii) remains undeviated

(iv) none of the above.

(c) The angle between the normal and refracted ray is called :

(i) angle of deviation

(ii) angle of incidence

(iii) angle of refraction

(iv) angle of emergence.

(d) The property of splitting of white light into its seven constituent colours is known as :

(i) rectilinear propagation

(ii) refraction

(iii) reflection

(iv) dispersion.

(e) The seven colours in the spectrum of sunlight in order, are represented as :

(i) VIBGYOR (ii) VIGYBOR

(iii) BIVGYOR (iv) RYOBIVG

(f) A ray of light passing through centre of curvature of a spherical mirror, after reflection :

(i) passes through the focus

(ii) passes through the pole

(iii) becomes parallel to the principal axis

(iv) retraces its own path.

(g) If the radius of curvature of a concave mirror is 20 cm, its focal length is :

(i) 10 cm (ii) 20 cm

(iii) 40 cm (iv) 80 cm.

(h) The image formed by a convex mirror ix :

(i) erect and diminished

(ii) erect and enlarged

(iii) inverted and diminished

(iv) inverted and enlarged.

(i) The image formed by a concave mirror is of the same size as the object, if the object is placed :

(i) at the focus

(ii) between the pole and focus

(iii) between the focus and centre of curvature

(iv) at the centre of curvature.

(j) A convex mirror is used :

(i) as a shaving mirror

(ii) as a head mirror by a dentist

(iii) as a rear view mirror by a driver

(iv) as a reflector in torch.

Ans. (a)-(i), (b)-(ii), (c)-(iii), (d)-(iv), (e)-(i), (f)-(iv), (g)-(i), (h)-(i), (i)-(iv), (j)-(iii)

A block of mass $m$ is at rest while a force is acting on it horizontally. What type of friction is opposing the movement of the block?

Calculate the mechanical advantage for a load of 40 N, when the required force to lift the load is 15 N.

Hi my chemistry teacher told me that the melting point and the freezing point of water is the same is it true

Foot and yard are units to measure _______.

Which of the following statements are correct when you are riding a bicycle?