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Which of the given 2 vectors are negative of each other?

What energy transformation takes place in generation of power from geo thermal energy?

When a liquid starts to boil during heating, its temperature ___.

A magnet attracts iron fillings towards it. Does the magnet do any work?

Which of the following uses an electric cell for working?

Question 19

Observe the below picture. Water is being boiled in a pan of wide base

(i) Which position P or T will feel warmer?
(ii) Fill up the boxes P and T to indicate the predominant mode of heat transfer.

Why wasn't the convention changed after it was discovered that electric current is actually the flow of electrons

Sita asked her son Krishna to find out the odd one out regarding cuboid from the given products, which are used in day to day life. Which product would be picked by Krishna?

Femto stands for:

Which region is present in the shadow formed by a point source of light?

Poles of a bar magnet is located _________.

A ball is thrown from the top of a building. As it approaches the ground, which of the following decreases?

If a man finds his image to be at a distance of $50m$ from him, what would be his actual distance from the mirror?

Difference between velocity and speed?

An object having dimensions 1 m by 2 m by 3 m and 2 kg mass. What is its density in $\frac{kg}{m^3}$? Would it float in water?

Density of water($d_{water}$ = 1000 $\frac{kg}{m^3}$)

Write three differences between work and power. [3 MARKS]

In the following system, the holes of the same size A and B are made at the same level. Let the speed of the water emerging from the two holes be $v_A$ and $v_B$ respectively. Which among the following option is correct?

A wire oriented in the east west direction carries a current eastward. Direction of the magnetic field at a point to the south of the wire is:

Q9. Consider the following statements:

1. Ramsar Convention was signed in Iran in 1971.

2. It is an intergovernmental treaty which provides the framework for national action and international cooperation for the conservation and wise use of wetlands and their resources.

3. Ramsar Convention is the only global environment treaty dealing with a particular ecosystem.

Which of the above statement/s is/are correct?

An object is placed at a distance 40 cm from a convex lens of focal length 20 cm. The image formed is:

Metal cap of an electric cell is __________ terminal of the cell.

A chef while cooking cuts his hand with a sharp-edged knife, but to his surprise, his hand did not cut with a spoon even on the application of a greater force. Why did it cut from a knife for a smaller force?

Two sound waves, named A and B, are travelling in the air. If, wave A has a time period of 2 seconds and an amplitude of 3 cms and wave B has a time period of 3 seconds and an amplitude of 11 cms, then which of the following statements are correct?

Sun appears red at sunrise and sunset. This happens because the component of light having _________, gets scattered away.

What will happen when a beam of light strikes the marble floor if water is spread over it?

If you stand 3 m in front of a plane mirror, how far away would you see yourself in the mirror?

Which of the following is true for a body in uniform motion?

Which phenomenon of light is indicated in this figure:

If half part of a convex lens is covered, the focal length ___________ and the intensity of image __________.

Why cannot nuclear energy be used directly to cook food?

A ball is dropped from a height of 30m. After striking to the surface it rises to $\frac{2}{3}$ of its height. Again it falls on the surface and this time it covered only $\frac{2}{5}$ of its previous height. It continued for next two times and it only covered half of its previous height. Find the distance covered by ball and also find numbers of times it strike to the surface. [4 MARKS]

Some pins are placed near the end of a nail shown in the circuit diagram. Now the current is switched on for some time and then switched off. What will happen?

Which parameter directly indicates that a body is moving faster as compared to another body?

The mass of a body is 25 kg. What would the weight of the body be in:

(i) Kgf and

(ii) Newton

take, $g=10m/s^2$

Question 43

In the following question, fill in the blanks with correct symbol >, < or =.

If m is a common divisor of a and b, then $\frac{a}{b}=\frac{a÷m}{-}$

Stars appear to revolve around which of the given celestial body?

Question 3

Three bulbs A, B, C are connected in a circuit as shown in Figure. When the switch is ‘ON’

(a) bulb C will glow first

(b) bulb B and C will glow simultaneously and bulb A will glow after some time

(c) all the bulbs A,B and C will glow at the same time

(d) the bulbs will glow in the order A, B and C

Write eg

Device were magnetic effects of current is used

Device were heating of current were used

Look at the given figure -

Select the correct option(s) from the following?

What is density exactly?

The objects made of steel, mica, wood and brass are lying in the same room during winter season. The objects which will feel warmer to touch are:

An auto travels the first half time with a uniform speed '$a$' and the next half time with a uniform speed '$b$'. Find its average speed.

Give approximate ratio of 1 AU and 1 light year.

Question 3 (a)
Fill in the blanks :
(a) The hotness of an object is determined by its___.

Which of the following is the example of a circular motion?

Question 3

Three magnets A, B and C were dipped one by one in a heap of iron filing. Fig. shows the amount of the iron filing sticking to them.

The strength of these magnets will be

(a) A > B > C

(b) A < B < C

(c) A = B = C

(d) A < B > C