Science Std IV Chapter 14

14. Our Neighbours in Space

A. Choose the correct answer to complete the statement.
1. _______________ is the seventh planet from the sun. (Uranus/Mars)
2. Mars is also known as the ________________ planet. (yellow/red)
3. Pluto is one of the ________________ planets which was earlier considered
    as a planet. (giant/dwarf)
4. The earth is the only planet on which water exists in ________________ form.
    (liquid/gaseous)

B. State whether the following statements are true or false.
1. The earth has mountains, valleys, old volcano sites and many bowl-like holes
    called craters on its surface.
2. The earth's axis runs from the north pole to the south pole.
3. The region of the earth near the equator receives almost the same amount of
    sunlight throughout the year.
4. Ursa Major, Ursa Minor and Orion are some of the galaxies.
5. The hemisphere near the sun has shorter and warmer days because the sunrays
    fall directly on it.

C. Answer the following questions.
1. Name all the planets of the solar system in the right order.
2. Give information about the following:
    (a) Jupiter  (b) The sun   (c) Pluto   (d) The moon   (e) Mercury
3. How is the earth different from the other planets?
4. Explain the following terms:
    (a) Equator    (b) Axis   (c) Orbit   (d) Poles
5. How does rotation of the earth cause day and night?
6. How is revolution of the earth responsible for change in seasons? Explain with a
    diagram.
7. What is a star?
8. What is an equator?
9. Why is the earth known as the blue planet?

D. Match the following.

             Column A                 Column B

     1. Venus                        (a) Eighth planet

     2. Saturn                       (b) Dwarf planet

     3. Mars                          (c) Evening star

     4. Neptune                     (d) Planet with a system of rings

     5. Pluto                           (e) Red planet

E. Tick the correct answer.

1. Which of these is the largest planet in the solar system?

     (a) Jupiter     (b) Saturn    (c) Uranus

2. The imaginary line around the earth which is at equal distance from both the

    poles is

     (a) axis      (b) orbit     (c) equator

3. Which of these is the smallest planet in the solar system?

     (a) Neptune    (b) Mercury    (c) Venus

4. Which of these is the brightest planet in the solar system?

     (a) Earth     (b) Mercury    (c) Venus

5. Which of these planets is known as evening star?

    (a) Mercury   (b) Earth      (c) Venus    (d) Jupiter

6. Which of these is a dwarf planet?

    (a) Saturn    (b) Uranus    (c) Pluto    (d) Jupiter

F. Give one word for the following.

1. Number of days to complete one revolution

2. Smallest planet of the solar system

3. Planet with a system of rings

4. Groups of stars in the sky

5. Natural satellite of the earth

6. The largest planet in the solar system

7. Imaginary line which divides the earth into two equal parts

G. Complete the following series in which planets are arranged in increasing order

     of their distance from the sun.

H. Find out eight words related to planets in the given grid. The words may read

     forward, backward and across.

     















I. Define rotation.

J. Write an experiment to prove that rotation of the earth causes day
    and night with a neat labelled diagram.

Science Std IV Chapter 12

12. Force, Work and Energy

A. Fill in the blanks.
1. A pulley is used to ________________, lower or ________________ a load.
2. ________________ is done when force applied on an object moves it.
3. ________________ is the force with which the earth pulls objects towards itself.
4. Muscular force is the force exerted by our ________________.
5. ________________ is a grooved wheel with a rope or a cable around it.

B.Answer the following questions.
1. What is force? What changes can force bring in an object?
2. What are the different types of forces?
3. Define work.
4. How does machine help us?
5. What are the different kinds of simple machines?
6. What is energy? Name the various forms of energy.
7. What is solar energy? How is it useful to us?
8. Define atomic energy.
9. What is a wedge?
10. How can we generate electricity?
11. What is muscular force?
12. Name a part of the human body which is an example of lever.
13. Name two devices in which electricity from solar energy is used.

C. Match the following.
         Column A                              Column B
1. Screwdriver                          (a) Pulley
2. Can opener                          (b) Wedge
3. Lift                                        (c) Wheel and axle
4. Axe                                       (d) Lever

D. Tick the correct answer.
1. The energy released on joining or breaking of atoms is known as
    (a) atomic energy   (b) solar energy   (c) magnetic energy
2. See-saw is an example of
    (a) pulley    (b) screw    (c) lever
3. Which of these is not an effect of force?
    (a) Change in colour    (b) Change in size   (c) Change in direction
4. The energy possessed by which of these is not used to turn turbines?
    (a) Wind    (b) The sun    (c) Water
5. Which of these is used by plants to prepare their own food?
    (a) Wind energy    (b) Solar energy    (c) Water energy
6. Falling of an apple from a tree is an example of
    (a) gravity    (b) work    (c) friction
7. Knife is an example of
    (a) screw     (b) wedge    (c) pulley     (d) lever
8. The ability to do work is called
    (a) energy    (b) force    (c) friction    (d) gravity
9. Escalator is an example of
    (a) inclined plane   (b) lever    (c) wedge    (d) screw
10. Windmill works due to the energy generated from
      (a) water   (b) wind     (c) sun    (d) both (a) and (b)

E. Complete the following web charts.

F. Complete the crossword using the given clues.
Down:    1. The ability to do work (6)
              2. The smallest particle of matter (4)
              5. The main source of energy on earth (3)
Across:  3. The force by which the earth pulls everything towards itself (7)
              4. Muscular force is the force exerted by our ___________. (7)
              6. Its energy is used to turn windmills (4) 

G. Answer in one word or few words.
1. Energy obtained from the sun.

H. Name the type of force responsible for the following.
1. A stone falling from a height
2. A man pushing a car
3. A ball thrown up in the air comes down
4. A girl slowing down her bicycle
5. A ball rolling on the ground comes to rest

I. Identify whether work is done or not in the following cases.

1. Rohan is pedaling his bicycle.
2. Aarushi is trying to push a tree.
3. Vishal has thrown a ball.
4. Sukriti is holding a flower vase.

Science Std IV Chapter 7

7. The Digestive System and Teeth

A. Fill in the blanks with correct answers.
1. The digestive process begins in the _______________. (stomach/mouth)
2. From the food pipe, the food comes into the _______________.
    (stomach/small intestine)
3. The waste called ________________ (saliva/faeces) is then expelled out through
    the _________________. ( anus/large intestine)

B. Give one word answer for the following:
1. The hard, white and shiny part of the tooth
2. The chisel-shaped teeth at the front of the mouth
3. The number of molars in each jaw of an adult.
4. The soft tissue that surrounds the base of a tooth.
5. Yellow coating formed by germs on teeth.
6. The process by which food is broken into simpler form

C. Answer the following questions.
1. Draw a well-labelled diagram of the digestive system.
2. What happens to the food in the stomach?
3. What is the function of the liver?
4. What happens to the food in the small and large intestines?
5. Why should we chew our food properly?
6. What are temporary and permanent teeth?
7. Explain the structure of a tooth with the help of a labelled diagram.
8. Write the number and function of each of the following kinds of teeth:
    (a) Molars  (b) Incisors  (c) Canines  (d) Premolars
9. Mention a few ways to protect teeth from decaying.
10. Define 'Temporary Teeth'.

D. Fill in the blanks.
1. Germs form a sticky yellow coating called _______________ on the teeth.
2. The liver pours its digestive juices into the _______________ intestine.
3. We should use __________________ to clean the gaps between the teeth.
4. Chewing helps in breaking down food into _______________ pieces and mixing
    it with the __________________.
5. The __________________ is large, sac-like organ.

E. State whether the following statements are true or false.
1. There are four types of permanent teeth.
2. Temporary teeth don't fall off easily.
3. Enamel is the hardest substance.
4. The small intestine is the smallest portion of the digestive system.
5. Saliva contains enzymes.

F. Tick the correct answer.
1. The undigested food passes into the
    (a) large intestine   (b) small intestine   (c) stomach   (d) anus
2. The visible part of a tooth is the
    (a) dentine   (b) pulp   (c) crown   (d) root
3. The flat and broad teeth used to crush, crack and chew the food are
    (a) incisors   (b) premolars   (c) canines   (d) molars
4. Food is first softened with a watery substance called
    (a) pulp   (b) enzyme   (c) plaque   (d) saliva
5. The soft centre of the tooth is called
    (a) gum   (b) dentine    (c) pulp   (d) root
6. The outer part of the tooth is called
    (a) crown  (b) root  (c) enamel  (d) dentine

G. Complete the following web charts.
1. 

2. 

H. Find nine words related to this chapter in the given grid. The words may read
     forward, backward and across.