Observe the given figure, water is being boiled in a pan of wide base.(i) Which position Por T will feel warmer?
(ii) Fill up the boxes P and T to indicate the mode of flow of heat to the hand.

An LED requires two cells In series to glow. Tanya made the circuit as shown in given figure. Will the lamp glow? If not, draw the wires for correct connections.

What is the reason for a solar eclipse is visible only in a small part of the Earth's surface?

What causes the different phases of the Moon?

Which group of animals is adapted to bring partially digested food back to the mouth for further chewing and why is this adaptation beneficial?

After rainwater infiltrates into the soil, it

Why do people living in coastal areas experience sea breezes?

Which of the following is a good example of convection?

Why do metal spoons feel colder than wooden spoons in winter?

What factor causes river rocks to become smooth over time?

You brought some fruits from the market. Some days later, they rotted. What change did occur there?

A man painted his main gate made up of iron, to
(i) prevent It from rusting.
(ii) protect it from the Sun.
(iii) make It look beautiful.
(iv) make it dust free.
Which of the above statements is/are correct?

A scientist tests a soil sample from a uncultivated field and concludes that the soil is highly basic in nature. She suggests that adding organic matter in the soil could improve the quality of the soil. How does organic matter improve the quality of the soil?

A student is stung by an ant while playing. An elderly person suggests rubbing moist baking soda in the region to get quick relief. What does moist soda do to the sting of an ant?

A student has four solutions among which one is acidic in nature. She wants to identify the acidic solution using a litmus paper. Which of these observations would help to identify the acidic solution?

Which of the following materials would be the best conductor of electricity?

What would happen, if the electric circuit has a break or open switch?

If a cell in a circuit is connected in reverse, what happens to the current in the circuit?

Explain why does a shiny tea pot stay hotter than a dull brown pot?

A student observed the Moon in the night sky for a month and noticed changes in its shape every night. (i) What is this changing appearance of the Moon called and why does it happen? (ii) Explain how the positions of the Earth, Moon and Sun affect what we see from Earth?

Frogs are amphibians. They survive on land and water, do they have any respiratory issue? How do frogs breathe when they are in water? Do they possess lungs?

Ruminants such as cows and buffaloes swallow their food hurriedly and then sit restfully and chew their food. Give reason. 

After heavy rainfall, water collected on the field slowly disappeared.
(a) Name two natural processes responsible.
(b) Which one helps recharge groundwater?
(c) Why is this important in villages?

Paridhi and Anusha of Grade 7 started running for their morning workout. After they completed their running, they counted their breaths per minute. Anusha was breathing faster than Paridhi. Provide at least two possible explanations for why Anusha was breathing faster than Paridhi?

Some changes are given here. Write physical changes in the area marked 'A' and chemical changes in the area marked 'B'. Enter the changes which are both physical and chemical in the area marked 'C'.
Process of burning a candle; tearing of paper; rusting; curdling of milk; ripening of fruits ; melting of ice ; folding of clothes; burning of magnesium and mixing baking soda with vinegar.

Paheli observed that most of the fish in the pond of her village were gradually dying. She also observed that the wastes of a factory in their village are flowing into the pond which probably caused the fish to die.
(i) Explain why the fish were dying?
(ii) If the factory waste is acidic in nature, how can it be neutralised?

While playing in a park, a child was sting by a wasp. Some elders suggested applying paste of baking soda and others lemon juice as remedy. Which remedy do you think is appropriate and why?

A torch is not functioning, though contact points in the torch are in working condition. What can be the possible reasons for this? Mention any three.

Meena connected a battery, bulb and a key (switch) with proper wires. When she turned the key ON, the bulb glowed. Her friend Rita used the same setup but did not include the key. Yet her bulb was glowing. Give reason.

Assertion (A) The Earth's rotation causes the Sun to rise in the east and set in the west.
Reason (R) The Earth rotates from west to east, making it appear as though the Sun moves across the sky from east to west.
CODES:
(a) Both A and R are true and R is the correct explanation of A.
(b)Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A s false but R is true.

Assertion (A) : Melting of wax is physical change.
Reason (R) : No new substance is formed during melting of wax.
CODES
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true, but R is not the correct C explanation of A.
(c) A is true, but R is false.
(d) A is false, but R is true.

Assertion (A) Turmeric stain on clothes turn red when it is washed with soap.
Reason (R)The soap solution is basic in nature.
CODES:
(a) Both A and R are true and R is the correct explanation of A
(b) Both A and R are true, but R is not the correct explanation of A
(c) A is true, but R is false
(d) A is false, but R is true

Assertion (A) : battery provides more power than a single cell.
Reason (R) : A battery is a group of cells joined together to supply more voltage
Codes
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.

What happens when magnesium is burned in air? Write a word equation for this process. Name the type of change which takes place.

Label the following parts of given figure and name them.

(a) The largest gland in our body.
(b)The organ where protein digestion starts.
(c) The organ that releases digestive juice into the small intestine.
(d) The organ where digested food is absorb

If you leave a piece of iron in the open for a few days, it acquires a film of brownish substance, called rust.
(i) Do you think rust is different from iron?
(ii) Can you change rust back into iron by some simple method?
(iii) Do you think formation of rust on iron is a chemical change?
(iv) Give two other examples of a similar type of change.

A torch requires 3 cells. Show the arrangement of the cells with a diagram inside the torch, so that the bulb glows.

In figures A and B, shown a bulb connected to a cell in two different ways.
(i) Mention the direction of the current through the bulb in both the cases (0to Por P to Q).
(ii) Will the bulb glow in both the cases?
(iii) Does the brightness of the glowing bulb depend on the direction of current through it?

Imagine you are a scientist studying the seasons on Earth. You notice that during the summer months, some regions experience longer daylight hours, while others have shorter daylight hours. This phenomenon occurs due to Earth's tilt and revolution around the Sun. You discover that different parts of the Earth receive varying amounts of sunlight at different times of the year, which causes the temperatures to fluctuate and leads to the changing seasons. As part of your research, you also observe that during the summer solstice, the Northern hemisphere is tilted toward the Sun, while the winter solstice occurs when the Southern hemisphere is tilted toward the sun.
(i) Based on the case study, which of the following is true regarding the Earth's tilt?
(a) The Earth's tilt causes the changing lengths of the days and nights during the year.
(b) The Earth's tilt causes the Earth to orbit around the Sun.
(c) The Earth's tilt has no effect on the climate of different regions.
(d) The Earth's tilt makes the Sun move across the sky in a circular path.
(ii) Why does the Northern hemisphere experience summer during the June solstice?
(a) The Southern hemisphere is tilted toward the Sun.
(b) The Northern hemisphere is tilted away from the Sun.
(c) The Northern hemisphere is tilted toward the Sun.
(d) The Earth is closest to the Sun during June.
(iii) During the December solstice, which part of the Earth receives the most un light?
(a) The Northern hemisphere
(b) The Southern hemisphere
(c) The equator
(d) Both hemispheres equally
(lv) What causes the variation In sunlight received by different regions on Earth during the year?
(a) The Earth's distance from the Sun.
(b) The Earth's axial tilt and revolution around the sun.
(c) The Moon's position relative to the Earth.
(d) The Earth's rotation speed.

Red rose is a natural indicator use for the detection of acids and bases. The flower's petals are put in warm water for an hour. The water, after one hour can be used as an indicator. It is light pink in neutral conditions. It turns green in basic conditions and red in acidic
conditions.Zeenat takes 10 mL of three colourless liquids in separate test tubes. She add 5 drops of red rose indicator to each test tube. The pictures show the colour of the liquid in each test tube after the addition of indicator.
(i) Which test tube contains liquid soap?
(ii) Why are red rose petals put In warm water to make the Indicator?
(iii) Why did Zeenat add the same amount of Indicator to the three test tubes ?

The figure shows an electric circuit.(i) What will happen, if another battery is added to the circuit ?
(ii) What is the direction of the flow of electric current in the circuit ?
Use small arrows to show the direction in the picture.

Name the parts of the alimentary canal where
(a) water gets absorbed from undigested food
(b) digested food gets absorbed
(c) the undigested food is eliminated
(d) bile juice is produced

What is weathering, and how does it help in soil formation?