QUESTION BANK (2016-2017)
SCIENCE
STD: VII
TOPIC: MOTION AND TIME
Q.I) Answer the following in one sentence.
(1 mark)
1. Explain how motion of a child on a see-saw is an oscillatory motion.
2. What is a bob?
3. What is the use of odometer in a vehicle?
4. Name the motion of a train on a straight bridge.
5. If a car is moving with a speed of 5 km/h on a highway find the distance travelled by the car in 3
hours?
6. What is the S.I unit of speed?
7. What is the use of speedometer in a vehicle?
Q.II) Answer the following questions:
(2marks)
8. Differentiate between uniform and non-uniform motion.
9. For a simple pendulum; define:- a)one oscillation b)time period
10. Explain, how in ancient times, a day, a month and a year was measured.
11. Name the different types of clocks used in early times.
12. What is meant by oscillatory motion?
13. Which devices are used to measure time intervals?
14. What information does a distance- time graph give us?
15. What is the difference between Distance and time?
16. What is velocity?
17. A simple pendulum takes 36 s to complete 20 oscillations. What is the time period of the pendulum?
Q.III ) Answer the following questions in brief.
18. Name the graph most suitable to show:
a) runs covered in various over of cricket match
b) distance covered by a car with time
c) composition of air in percentage
(3marks)
19. Describe a simple pendulum. Draw a diagram. What kind of motion does it show?
20. A bus travelled the first 40km of a journey in one hour and the next 60 km in the next one hour.
Calculate the speed of the bus.
21. Does an apple falling down from a tree show uniform or non-uniform motion?
22. A car travels with speed 45 km/h takes 20 min to reach destination. Calculate the
distance.
Q.IV) Answer the following questions in detail.
(5Marks)
23. What is the time period of a simple pendulum? How would you calculate it experimentally?
24. a)Roma walked a distance of 270metres from her home to a park in 3minutes.What
was her speed during this walk?
b)Can the time period of a pendulum be changed ?Explain.
25. The distance covered by the bus at various instance of time are recorded as follows
Distance (km) Time (pm)
-
0
10
20
30
40
50
2.00
2.30
3.00
3.30
4.00
4.30
i)What distance was covered by the bus at 3.15 pm?
ii) At what time the bus completes 40km?
iii) At what time the bus has started?
TOPIC: ELECTRIC CURRENT AND IT’S EFFECTS
QI. Answer the following in one sentence:
1. What is meant by electric current?
2. What is magnetic field?
3. Under what conditions a circuit is said to be complete?
4. What is a switch?
5. Draw the symbols for various Components of an electric circuit:
(a) Battery
(b) Electric bulb
6. What is a circuit diagram?
(1 mark)
7. What is an electric circuit?
QII. Answer the following questions:
(2 marks)
8. What do mean by heating effect of current? Give an example.
9. Name few appliances which use heating effect of current.
10. What are filaments of a bulb and a heater made up of?
11. As length of element increases heat produced increases. Give Reason.
12. What are the reasons for excessive current flowing through a circuit?
13. Name any two effects of electric current.
14. What are MCBs?
15. Differentiate between: Electric iron and Electric bell.
16. Provide the single word for the following:
a. When the current in the circuit increases abruptly.
b. When the live wire comes in direct contact with the neutral wire.
17. Explain the formation and uses of battery.
QIII. Answer the following questions in brief:
(3 marks)
18. Differentiate between: MCBs and Electric fuse.
19. What do mean by magnetic effect of current? Name the scientist who discovered it.
20. How does an electric fuse work?
21. What are the factors on which amount of heat produced depends?
22. Do you think an electromagnet can be used for separating glass pieces from a garbage heap?
Explain.
QIV. Answer the following questions in details:
(5 marks)
23. (a) What is an electric fuse?
(b)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.
24. Mention the differences between an electromagnet and a permanent magnet.
25. What is an electromagnet? What are the factors affecting strength of an electromagnet? What
are the uses of an electromagnet?
TOPIC: LIGHT
QI. Answer the following in one sentence:
(1 mark)
1. Give an example to show that the path of light is always straight and never curved.
2. What is the image of an object?
3. Name the mirror having curved reflecting surface.
4. What is real image?
5. What kind of image is formed by convex lens?
6. Which type of surface acts as a mirror?
7. Identify a spherical lens which is thinner at the center and thicker at edges.
QII. Answer the following questions:
8. Why the word ‘AMBULANCE’ is painted left-right inversed on the vehicle?
9. State uses of convex mirror.
10. What is a virtual image? Which type of lens always forms a virtual image?
11. State various applications of lenses.
12. How rainbow is formed in the sky?
13. Explain the difference between regular and irregular reflection.
14. Give reason: We do not see an image in transparent glass.
15. Why do we use a plane mirror while getting ready?
16. Provide the proper term for the following:
a. The bouncing of light by any smooth surface, like a mirror
b. The path of light is always straight and never curved.
17. Explain why numerous images are seen in the ‘Palace of Mirrors’.
(2 marks)
QIII. Answer the following questions in brief:
(3 marks)
18. What is a concave mirror? State the uses of concave mirror.
19. Write the difference between the two types of spherical mirror.
20. The colors in a rainbow are the colors of sunlight. Give reason.
21. State the characteristics of the image formed by a plane mirror.
22. What is lateral inversion of a flat mirror?
QIV. Answer the following questions in details:
(5 marks)
23. Define light. Give the important properties of light.
24. Differentiate between: Concave and convex lens.
25. Write a detailed note on images formed by lenses.
TOPIC: FORESTS: OUR LIFELINE
QI. Answer the following in one sentence:
(1 mark)
1. Name the resource that serves as green lungs and water purifying systems in nature.
2. What is crown of the tree?
3. Name some insects found in forest.
4. What is canopy?
5. Name any two forest products.
6. Define: Understoreys.
7. What happens if an animal dies in the forest?
QII. Answer the following questions:
(2 marks)
8. Complete the following food chain: Grass --->Insects __________ --->snake ---> ________.
9. The area surrounded by forest receive good rainfall. Explain.
10. What are the factors responsible for clearing of forests?
11. Give reason: Forest is source of medicinal plants.
12. What is Endemic species? Give two examples.
13. Rearrange the jumbled words to get word related to forest.
a. OCNPAY
b. VOPRTEOIANA
14. How water pollution will be affected with the depletion of forest?
15. What is the interrelationship between plants, soil and decomposers?
16. Provide the single word for the following:
a. The process by which plants release oxygen.
b. The plant that forms the lowest layer in forest.
17. Why even after a heavy rainfall, the ground in the forest remains dry?
QIII. Answer the following questions in brief:
(3 marks)
18. Discuss the role of forest in maintaining the balance between oxygen and carbon dioxide in
the atmosphere.
19. Describe the role of Forest in Water Cycle and in Soil Conservation.
20. Forest helps in preventing floods. Give reason.
21. Explain the importance of forest.
22. What are the benefits of residing in nearby forest area?
QIV. Answer the following questions in details:
(5 marks)
23. Explain why forest is called “the dynamic living entity”?
24. What do you understand by deforestation? Enlist the ill-effects of deforestation.
25. What are decomposers? Explain with example. The micro-organisms called decomposers
play an important role in the forest. Discuss