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Which of the following mirror(s) can form real images?

A ship leaves a port and travels 12km due east. Then it turns and travel 9km due north. How far is the ship from the port?

Which of the following is an effect of destruction of forests?

The area under v – t graph gives ___ .

I J = 1 ____-m

What is the acceleration due to gravity?

In which of the following cases, friction is a friend?

Two bodies A and B have thermal emissivities of 0.01 and 0.81 respectively. The outer surface areas of the two bodies are the same . The two bodies emit total radiant power at the same rate. The wavelength ${\lambda }_B$ corresponding to maximum spectral radiancy in the radiation from B shifted from the wavelength corresponding to maximum spectral radiancy in the radiation from A, by 1.00 $\mu m$. If the temperature of A is 5802 K

A body moves at a speed of $20km{h}^{-1}$ for the first $2$ hours. After that, it moves at the speed of $30km{h}^{-1}$ for the next 1 hour. What is the total distance travelled by the body?

When do you call an object to be moving? [1 MARK]

Raw materials for photosynthesis is primarily obtained from

The pressure that has to be applied to the ends of a steel wire of length 10 cm to keep its length constant when its temperature is raised by ${100}^{\circ }Cis(ForsteelY=2\times {10}^{11}N{m}^{-2}$ and $\alpha =1.1\times {10}^{-5}{K}^{-1})$

1 degree rise on celsius scale is equal to _____ degree rise on fahrenheit scale.

In a plane mirror, the middle surface is covered with a dark paper. How many images of yourself will you see in the mirror if earlier you could see only 1 image?

Match the following:

Column A Column B

(a) Electric power (i) volt

(b) kWh (ii) joule

(c) Electric current (iii) $volt\times ampere$

(d) Electric energy (iv) watt

(e) watt (v) ampere

(f) Potential difference (vi) electric energy

Select the correct option that is a safer measure to practice during a thunderstorm.

Question 5

Four arrangements to measure temperature of ice in beaker with laboratory thermometer are shown in Figure(a, b, c and d). Which one of them shows the correct arrangement for accurate measurement of temperature?

How do tourists throwing plastic bottles/covers and other litter in national parks, affect the forests?

Sheela has 3/7 kg of wheat. She bought 4/9 kg more. The total quantity of wheat is

Question 14

For setting curd, a small amount of curd is added to warm milk. The microbes present in the curd help in setting if the temperature of the mixture remains approximately between ${35}^{\circ }C$ to ${40}^{\circ }C$. At places, where room temperature remains much below the range, setting of curd becomes difficult. Suggest a way to set curd in such a situation.

When we blow air in particular region,Does the pressure in that particular region affects?

Who was the first person to notice the magnetic effect of electric current?

What is the ultimate source of energy on the earth? Which process is responsible for the energy?

What doeslay a finger on somebody mean?

What is there in a black hole

Concave lens have focus!but how I am not understanding it is not mirror so how will is refract?

Question 1 (iii)

Fill in the blank in the following.
Paper is not a ___ material.

A body has a displacement of 10 meters with average velocity of $5m/s$.Time taken is

Which particle flows to produce electric current in a wire?

A paper ball is kept at the mouth of a plastic bottle. When the bottle is compressed by hand, the paper ball will be pushed out. This is because:

Sam's father and mother are astronauts. Last month they returned from a tour to the Moon. Sam's father told him that they had air filled helmets and they also had microphones, which they used for talking to each other. Why did they use microphones to talk even after they were close enough to hear the sound of each other?

Ram wants to make a magnet. Which of the following materials he cannot make use of?

What does the area under the curve of a velocity-time graph represent?

What are the chemical changes observed when fuel used by car is exhausted?

A 5.2 g of a substance occupies 1.11 cm³. Its density to appropriate significant figure is:

A ship made of iron floats on water because ___ of the ship is less than that of water.

Sound is produced in an electric bell, when: