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Can light travel in vacuum?

Select the correct option:

10 mm = ____ m

A cone kept under a lighting bulb will cast the shadow like a

Which of the following statements is true about convection?

The work done against gravity in shifting a baggage from the first floor of a building to the second floor is 100 J. The change in gravitational potential energy of the baggage is:

Question 14

Boojho shines monochromatic light from a laser torch on a prism. Will he be able to observe a band of seven colours? Explain with a reason.

Why cannot we see an upside-down image of a ball through the pinhole camera?

How do we write with chalk on blakboabla

Himanshu was challenged by his friend Sushweta to differentiate between a plane, concave and convex mirror without touching them. He placed a candle in front of each of the mirrors and observed that they showed different behavior. Mirror I always formed a diminished image, Mirror II always formed an image of same height while for Mirror III the image was enlarged when the candle was placed close to mirror. Can you help him identify them?

Which of the following is not a luminous body?

A cuboid has a length $\left(l\right)$ of 10 cm, breadth $\left(b\right)$ of 12 cm and height $\left(h\right)$ of 15 cm. Find the total surface area of the cuboid.

Which of the following can be used to burn a small piece of paper with the help of sunlight?

Suppose a body A at a higher temperature is brought into contact with another body B at a lower temperature. Which of the following is/are true?

What is the formula for area of a triangle ?

A boy is driving a car at a speed of 60 km/hr from his home to college. In the return journey, his speed was half of what it was in the ongoing journey. Calculate the total time of the entire journey. Given: Distance between college and home is 12 km. Also, find the average speed of the car for the entire journey. [5 MARKS]

Choose the right answer(s)
Major disadvantages of a mercury barometer include:

Name the temperature scale which does not have negative temperature readings. [1 MARK]

Write the algebraic expression for the volume of a cube, if its side (a) is reduced by 5.

The objects that emit light of their own are called?

Question 7 (ii)
Show the shape of the distance-time graph for the motion in the following cases:
(ii) A car parked on a side road.

All periodic motions are oscillatory motion. Is this statement correct? Give reason and also give two examples of oscillatory motion. [3 MARKS]

Which of these switches is a momentary switch which breaks the circuit when the external pressure is removed?

Sushweta was trying to measure the temperature of boiling water. She found the reading on the thermometer to be ${80}^{\circ }C$. Which of the following(s) can be the reason(s) for this?

Which of the following object forms the most prominent shadows?

On what factor(s) does the darkness of the shadow cast by an object depend on?

Why doesn't the north star appear to move like the other stars?
[1 MARK]

A cart with mass $20kg$ went $50m$ in a straight line on a plain and smooth road when a force of $2N$ was applied to it. How much work was done by the force?

Fuse wire has a _________ melting point and is made of alloy of ________ and _________. If the current in the circuit rises too high, the fuse wires ________.

The length of a rectangle is twice the width of it. If perimeter of rectangle is 42 m, find the area of the rectangle.

The period of revolution of an earth satellite close to surface of earth is 90 min. The time period of another satellite in an orbit at a distance of three times the radius of earth from its surface will be

A loud sound can travel long distance because, it___ compared to a gentle sound.

Which of the following planets has a highly tilted rotational axis?

Select the best way to store 2 bar magnets so they don't become weak with the passage of time.

An electric bell consists of ___

Question 3 (e)
Fill in the blanks :
(e) A cold steel spoon is dipped in a cup of hot milk. It transfers heat to its other end by the process of ___.

The tungsten filament of an electric lamp has a surface area A and a power rating P. If the emissivity of the filament is $ϵ$ and $\sigma$ is Stefan's constant, the steady temperature of the filament will be

Select the height upto which the water level could rise after opening the valve.

In which direction does a freely suspended magnet align? [1 MARK]