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Question 17

At a camp site there are tents of two shades - one made with black fabric and the other with white fabric. Which one will you prefer for resting on a hot summer afternoon? Give reason for your choice. Would you like to prefer the same tent during winter?

The Moon is a _____ of Earth.

After holding a pack of ice in your hand for some time, put your hand in water at room temperature. Your hand would now feel:

The value of absolute zero in celsius scale is

What is force?

The clocks or watches which have an electric circuit with one or more cells are called

a train takes 30 minutes to cover a distance of 180 km. calculate its speed

The image formed in the retina is:

The adjoining diagram shows the spectral energy density distribution $E_{\lambda }$ of a black body at two different temperatures. If the areas under the curves are in the ratio 16 : 1, find the value of temperature T.

Which of the following can be used to measure time?

An electrician is carrying out some repairs in a building. He wants to replace a fuse by a piece of wire. Would you agree with the electrician? Give reasons for your response.

Which of the following correctly defines the 'eye' of a cyclone?

Moon rotates on its own axis as it revolves around the earth. How many rotations does it make in one revolution?

What is physical quanties in physics? What are its two types scalars and vectors? How can we classify any physical quantities into scalars and vectors? Please explain clearly and little bit in an easy manner so that i can understand it properly especially scalars and vectors.

A body goes from C to D with a velocity of 20 m/s and comes back from D to C with a velocity of 30 m/s. The average velocity of the body during the whole journey is

You are given two cup of coffees. You can determine which one is hotter just by touching it. But is sense of touch reliable measure of hotness and coldness?

How does heat from Sun reach Earth? What is this mode called? [2 MARKS]

Potential difference in an electric circuit is created due to _____________.

Three blocks, each of same mass m, are connected with wires $w_1$and $w_2$ of same cross-sectional area a Young's modulus Y. Neglecting friction the strain developed in wire $w_2$ is

A 6-kg weight is fastened to the end of a steel wire of un-stretched length 60 cm. It is whirled in a vertical circle and has an angular velocity of 2 revolutions per second at the bottom of the circle. The area of cross-section of the wire is $0.05c{m}^2$. Calculate the elongation of the wire when the weight is at the lowest point of the path. Young's modulus of steel = $2\times {10}^{11}$ Pa.

An insect moves along the sides of a wall of dimensions 12 m $\times$ 5 m starting from one corner and reaches the diagonally opposite corner. If the insect takes 2 seconds for its motion, then find the ratio of average speed to the average velocity of insect.

Sound is produced by ______ bodies.

The symbols

, ,,

represent:

Which one of the following options makes a bulb to glow more brightly?

A car moves along the periphery of a square field of side 10m and takes 40 s to cover one side. What will be the magnitude of distance and displacement at the end of 2min and 20 seconds?

A man lifts a luggage of 10 kg from the ground and puts it on his head 1.7 m above the ground. Calculate work done by him on the luggage.

Assume acceleration due to gravity $g=10m/s^2$.

An ant drags a piece of sweet to a distance of 5m. What is the work done by the ant if she applies a force of 1 N?

An image is said to be formed when:

We can see objects when the light is reflected from the objects and it falls upon our eyes. Why can't walls act as mirror since even walls reflect light which falls on our eyes? [3 MARKS]

Q1. Consider the following statements

1. Dawn is the only mission ever to orbit two extra-terrestrial targets.

2. The Dawn mission orbited giant asteroid Vesta and now continues to orbit Ceres.

Which of the above statements are incorrect?

Give reason why displacement method is used for measuring the volume of an irregular solid

A bus can accelerate on a horizontal road due the force exerted by

Magnetic field lines have which of the following properties?
1. Magnitude
2. Direction
3. Colour

Question 27
Two rods of the same weight and equal length have different thickness. They are held vertically on the surface of sand as shown in the figure. Which one of them will sink more? Why?

The time is taken by Raj to cover a distance of 540 km at a speed of 60 km/hr

On which of the following factors does the direction of deflection of a magnetic needle depend?

What colour of light is obtained when we mix beams of light of all colour?

Question 16

Fig. shows a magnetic compass. What will happen to the position of its needle if you bring a bar magnet near it? Draw a diagram to show the effect of the needle on bringing the bar magnet near it. Also, draw the diagram to show the effect when the other end of the bar magnet is brought near it.

A wooden block is floating in a beaker having water. During the free fall of the beaker, the upthrust on the block will be ___.

___ is the number of cubes [rooms] on each floor. [Enter a numerical value]

Q. Which of the following is incorrect ?

a. A convex mirror can give a virtual image.

b. A convex mirror cannot give a real image.

c. A concave mirror can give a virtual image.

d. A concave mirror can give a diminished virtual image.

The point on the celestial sphere exactly below the observer's feet is called___

What is the difference between physical and chemical change with proper example?