A common substance used in loading is
A)
sodium
done
clear
B)
sulphur
done
clear
C)
chlorine
done
clear
D)
alum
done
clear
View Answer play_arrow
The distance between Delhi and Mumbai is usually expressed in units of:
A)
decameter
done
clear
B)
meter
done
clear
C)
centimeter
done
clear
D)
kilometer
done
clear
View Answer play_arrow
Objects that emit or give out their own light are called?
A)
Non-luminous objects
done
clear
B)
Opaque objects
done
clear
C)
Luminous objects
done
clear
D)
Translucent objects
done
clear
View Answer play_arrow
A material that does not allow the electricity to pass through it is known as.............
A)
conductor
done
clear
B)
electric cell
done
clear
C)
insulator
done
clear
D)
none of these
done
clear
View Answer play_arrow
"Catch water where it falls" is the basic idea behind:
A)
recycling of water
done
clear
B)
making dams to store water
done
clear
C)
rain water harvesting
done
clear
D)
condensation of water vapor
done
clear
View Answer play_arrow
Given below is a list of edible plants:
(i) Banana (ii) Pumpkin (iii) Lady's finger (iv) Brinjal
Which pair of plants has two or more edible parts?
A)
(i) and (ii)
done
clear
B)
(ii) and (iii)
done
clear
C)
(iii) and (iv)
done
clear
D)
(i) and (iv)
done
clear
View Answer play_arrow
Which of the following nutrients is not present in milk?
A)
Protein
done
clear
B)
Vitamin C
done
clear
C)
Calcium
done
clear
D)
Vitamin D
done
clear
View Answer play_arrow
Which part of the jute plant is used for getting jute fiber?
A)
Flower
done
clear
B)
Stem
done
clear
C)
Fruit
done
clear
D)
Leaf
done
clear
View Answer play_arrow
Pick the change that can be reversed from the following:
A)
Cutting of trees
done
clear
B)
Melting of ghee
done
clear
C)
Burning of candle
done
clear
D)
Blooming of flower
done
clear
View Answer play_arrow
Which of the following is not a correct match?
A)
Petiole: attaches leaf to stem
done
clear
B)
Lamina: green flat part of leaf
done
clear
C)
Margin: gives shape to the leaf
done
clear
D)
Veins: transpiration
done
clear
View Answer play_arrow
Answer the following questions in one word or in a sentence only. (i) Melting of wax is an irreversible change. Is it correct?
View Answer play_arrow
Answer the following questions in one word or in a sentence only. (ii) What are predators?
View Answer play_arrow
Answer the following questions in one word or in a sentence only. (iii) How did people know how far they have travelled?
View Answer play_arrow
Answer the following questions in one word or in a sentence only. (iv) Can we see any object in a completely dark room?
View Answer play_arrow
Answer the following questions in one word or in a sentence only. (v) How does an electric cell produce electricity?
View Answer play_arrow
Answer the following questions in one word or in a sentence only. (vi) Name the materials placed on the ground which are picked up by magnetic stick.
View Answer play_arrow
How do yaks and snow leopard protect themselves from extreme cold?
View Answer play_arrow
How do you decide whether an object is in motion or at rest?
View Answer play_arrow
Is air around us always transparent? Discuss.
View Answer play_arrow
Why should an electrician use rubber gloves, while repairing an electric switch at your home? Explain.
View Answer play_arrow
Write any two properties of a magnet.
View Answer play_arrow
Why is water essential for plants?
View Answer play_arrow
Why does a lump of cotton wool shrink in water?
View Answer play_arrow
Give examples to explain the difference between changes that can or cannot be reversed.
View Answer play_arrow
Correct the following statements and rewrite them in your note book. (a) Stem absorbs water and minerals from the soil. (b) Leaves hold the plant upright. (c) Roots conduct water to the leaves. (d) The number of petals and sepals in a flower is always equal. (e) If the sepals of a flower are joined together, its petals are also joined together. (f) If the petals of a flower are joined together, then the pistil is joined to the petal.
View Answer play_arrow
Bones are hard structures and cannot be bent. But, we can still bend our elbow, knee, etc. How is this possible?
View Answer play_arrow
Write the similarities and differences between the motion of a bicycle and a ceiling fan that has been switched ON.
View Answer play_arrow
Can you think of creating a shape that would give a circular shadow, if held in one way and a rectangular shadow, if held in another way?
View Answer play_arrow
When the chemicals in the electric cell are used up, the electric cell stops producing electricity. The electric cell is then replaced with a new one. In case of rechargeable batteries (such as the type used in mobile phones, camera and inverters), they are used again and again. How?
View Answer play_arrow
(i) How do the areas covered with concrete affect the availability of ground water? (ii) Why is there a need for conserving water? Give two reasons.
View Answer play_arrow
How are clouds formed?
View Answer play_arrow
How do plants and animals help each other in the exchange of gases in the atmosphere?
View Answer play_arrow
Correct the definitions of certain terms given below by changing only one word. (i) Compost: Substances converted into manure for use in industries. (ii) Landfill: Garbage buried under water in an area. (iii) Recycling: Reuse of unused material in the same or another form.
View Answer play_arrow
What is the purpose of using electric switch? Name some electrical gadgets that have switches built into them.
View Answer play_arrow
Write just a few sentences for an imaginary situation if any of the following gases disappear from the atmosphere: (i) Oxygen (ii) Carbon dioxide
View Answer play_arrow
Like many animals, although a car also moves, it is not considered as a living organism. Give 2-3 reasons.
View Answer play_arrow
Answer the following questions in one or two words or sentences: (a) Why should we prefer to use paper bags rather than polythene bags? (b) Who, out of the following should properly dispose of the garbage-father, mother, elder brother, younger sister? (c) Which one out of beetles, roundworms and earthworm are used for vermi-composting and why?
View Answer play_arrow