CBSE Class 7 Science Sample Paper Set 4

Q1. MULTIPLE CHOICE QUESTIONS: (1x4=4)

A. The best soil for making pots, toys and statues is:
(I) SAND
(II) LOAM
(III) CLAY
(IV) SILT

B. Seeds of sunflower andaak(madar) are dispersed by:
(I) WIND
(II) WATER
(III) ANIMALS
(IV) EXPLOSION

C. The seeds develop from the:
(I) OVULES
(II) STAMEN
(III) PISTIL
(IV) OVARY

D. The reproductive part of a plant is:
(I) STEM
(II) ROOT
(III) LEAF
(IV) FLOWER

Q2. Fill in the blanks: (0.5x4=2)
(1) The process of breaking down of rocks by the action of wind, water and climate is called -----------------.
(2) Burning of any substance is a ------------------------- change.
(3) ---------------generates suction pull which pulls water to great heights in plants.
(4) The process of fusion of male and female gametes is called --------------------.

Q3. Find the odd one out with a reason (1X3=3)
(i) Generator, geyser, heater, grinder, washing machine
(b) RBC, WBC, PLATELETS, PLASMA, HAEMOGLOBIN
(C) BURNING, RUSTING, COOKING, CRYSTALISATION, RIPENING

Q4. VERY SHORT ANSWER QUESTION (1x6=6MARKS)
(1) Rahul can see complete image of a 3m high pillar in a plane mirror fixed on the opposite wall. The distance between the pillar and the mirror is 4m. What is the height of the pillar’s image that Rahul can see? Also calculate the distance between the pillar and it’s image in the mirror?
(2) Why holes are made in hanging banners and hoardings?
(3) The air above the soil seems to shimmer on a hot summer day. Give reasons
(4) Same kinds of plants can be seen growing at different places on the earth. Give reasons.
(5) Why sometimes in summers white patches are formed in shirts underarms.
(6) When a candle burns both physical and chemical changes take place. Do you agree?Explain.

Q5. SHORT ANSWER QUESTIONS
(2X10=20)
(1) Writeword equation and chemical equation foreach of the following:
(a) The reaction between carbon dioxide and lime water.
(b) Dissolving of magnesium dioxide in water.
(2) Write any two differences between xylem and phloem.
(3) Write an activity to show that high speed winds are accompanied by reduced air pressure. Explain with the help of suitable diagrams.
(4) write the differences between soil pollution and soil erosion. Also write any two causes of soil pollution.
(5) Give two benefits of seed dispersal.
(6) Which the factors decide the nature of soil?
(7) Draw a neat and labelled diagram of excretory system.
(8) Explain reproduction ion spirogyra with the help of diagram.
(9) A plane mirror also forms inverted image. Do you agree? Why ambulance is written in a strange way on the vehicle?
(10) with the help of diagrams explain two types of lenses.

Q6.LONG – ANSWER QUESTIONS: (3X10=30)
(1) Why is blood needed by all parts of the body?
(2) What are the other changes which can accompany a chemical change?(any two)
(3) A chemical change which causes huge monetary loss by destroying bodies of ships, cars, trucks. How can we prevent it? Calculate the time period of a pendulum if it makes 72
oscillations in a minute.
(4) (a) Sanya found that 200ml of water took 20 minutes to percolate through a soil sample at the road side near her house.
(b) She used the same cylinder and found that 200ml of water took 50minutes to percolate through a soil sample in the garden near her house.
(c) Calculate the rate of percolation in (a) and (b) above and compare. Which sample of soil do you think contains more particles of sand than clay? Why?
(5) What are monsoon winds? How are they generated?
(6) What types of images are formed in a spoon? Explain.
(7) Write an activity to show that high speed winds are accompanied with reduced air pressure.
(8) Describe heating and magnetic effects of electric current with the help of one example each.
(9) How does thickness of a wire effect the heat produced in a wire? Explain by citing the examples of filament of a bulb and wire of an air conditioner.
(10) Plot a distance- time graph for a truck on the basis of following data and interpret it (Image)

Q7 DESCRIBE THE FOLLOWING: (5X3=15)

(1) Rajeel saw reddish brown substance formed when an iron blade was put in blue copper sulphate solution. He called it rust because he has heard about formation of rust from iron.
Please answer the following questions(a) Was he right in calling it rust? Give reasons.
(b) Write the chemical equation for the above equation.
(c) How does iron rust? Write the chemical equation.
(d) How can we prevent iron grills in our houses from rusting? What is galvanization?
(e) Why does rusting is faster at coastal areas?

(2) When we exhale in freshly prepared lime water it turns white.
(a) Why does it turns milky white?
(b) Write the chemical equation for the above reaction.
(c) What will happen if we add acetic acid in lime water?
(d) How do farmers use lime? Write the chemical formula?
(e) Write the effect of lime water on litmus paper and china rose solution. What do you conclude from it?
(3) Describe the working of an electric bell with the help of a diagram.

Please click the below link to access CBSE Class 7 Science Sample Paper Set 4.