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Read the following statements about diseases. (i) They are caused by germs. (ii) They are caused due to lack of nutrients in our diet. (iii) They can be passed on to another person through contact. (iv) They can be prevented by taking a balanced diet. Which pair of statements best describe a deficiency disease? (a) (i) and (ii) (b) (ii) and (iii) (c) (ii) and (iv) (d) (i) and (iii)

c) ii & iv Explanation A disease that is affected by a dietary deficiency of specific nutrients, especially a vitamin or... View Article

Read the food items given below. (i) Wheat (ii) Ghee (iii) Iodized salt (iv) Spinach (palak) Which of the above food items are “energy-giving foods”? (a) (i) and (iv) (b) (ii) and (iv) (c) (i) and (ii) (d) (iii) and (iv)

c) (i) and (ii) Explanation Fat and carbohydrates are energy-providing foods to our bodies. Fat is present in big quantities in ghee and carbohydrate... View Article

Which of the following nutrients is not present in milk? (a) Protein (b) Vitamin C (c) Calcium (d) Vitamin D

b) vitamin C Explanation Vitamin D is protein, calcium is present in considerable amounts in milk whereas vitamin C is... View Article

Which of the following sources of protein is different from others? (a) Peas (b) Gram (c) Soya beans (d) Cottage cheese (paneer)

d) Cottage cheese (paneer) Explanation Cottage cheese (paneer) is obtained from animals. It is an animal protein and peas, gram... View Article

Which one of the following food item does not provide dietary fiber? (a) Wholegrain (b) Whole pulses (c) Fruits and vegetables (d) Milk

d) Milk Explanation Milk is an animal product and dietary fibre is a plant product. Hence, milk does not have... View Article

Given below are jumbled words which are names of parts of a plant. Rearrange them to get the correct words. (a) LILCHI (b) ITRUF (c) SEANBOYA (d) GURSA (e) ROUNDGUNT

(a)L I L C H I : CHILLI Litchi is a small round fruit, which has a central stone surrounded... View Article

Name two ingredients in our food that are not obtained from plants or animals. Mention one source for each ingredient.

Two ingredients in the food that are not obtained from plants and animals are: i) Salt- it is obtained from... View Article

Where do bees store honey?

Honey bees collect the sweet juice from flowers which is known as nectar, convert it into honey and store the... View Article

Read the clues and fill up the blanks given below each of them. (a) Honeybees suck from flower. N_ _T_R (b) Animals which eat other animals. _A _N_V_R_S (c) Animals which eat only plants and plant products. HE_B_ _ _ _ E_ (d) Animals which eat both plants and animals. _MN I_O_ _ _

(a) NECTAR. Honeybees collect nectar from flowers and make honey from it. (b) CARNIVORES. The animals which eat other animals... View Article

Read each set of terms and identify the odd set. (a) Cow, milk, butter (b) Hen, meat, egg (c) Goat, milk, meat (d) Plant, vegetable, buttermilk

d) Plant, vegetable, buttermilk Explanation (a) cow, milk, butter. It is related as cow gives milk and butter can be obtained... View Article

Given below is a list of edible plants. (i) Banana (ii) Pumpkin (iii) Lady’s finger (iv) Brinjal Which pair of plants have two or more edible parts? (a) (i) and (ii) (b) (ii) and (iii) (c) (iii) and (iv) (d) (i) and (iv)

a) (i) and (ii) Explanation Banana has three edible parts that are fruit, flower, and stem. Pumpkin has two edible... View Article

Below are the names of some animals. (i) Cow (ii) Sheep (iii) Horse (iv) Ox Which of the above are sources of milk for human beings? (a) (i) and (iii) (b) (i) and (ii) (c) (ii) and (iii) (d) (iii) and (iv)

b) (i) and (ii) Explanation Cow and sheep are the sources of milk for human beings.Cows, buffaloes, sheep, goat, and... View Article

Honeybee makes honey from (a) pollen (b) petals (c) nectar (d) bud.

c) Nectar Explanation Bees collect nectar from different flowers and convert it into honey and then they store this honey... View Article

Given below are names of some animals. (i) Goat (ii) Human beings (iii) Cockroach (iv) Eagle which of the above animals form a pair of omnivores? (a) (i) and (ii) (b) (ii) and (iii) (c) (iii) and (iv) (d) (ii) and (iv)

(b) (ii) and (iii) Explanation Both human beings and cockroaches are omnivores as the feed upon plants or plant products... View Article

Draw an appropriate schematic diagram showing common domestic circuits and discuss the importance of fuse. Why is it that a burnt-out fuse should be replaced by another fuse of identical rating?

A fuse in a circuit prevents damage to the appliances and the circuit due to overloading. Fuse of a particular... View Article

Describe the working of an AC generator with the help of a labelled circuit diagram. What changes must be made in the arrangement to convert it to a DC generator?

Faraday’s law electromagnetic induction states that whenever a conductor moves in a magnetic field EMF gets induced across the conductor.... View Article

Explain the phenomenon of electromagnetic induction. Describe an experiment to show that a current is set up in a closed loop when an external magnetic field passing through the loop increases or decreases.

Electromagnetic induction is a phenomenon of generation of an electric current in a closed circuit by changing the magnetic field.... View Article

Draw a labelled circuit diagram of a simple electric motor and explain its working. In what way these simple electric motors are different from commercial motors?

Principle A current-carrying conductor, when placed in a magnetic field, experiences a force. If the direction of the field and... View Article

Describe the activity that shows that a current-carrying conductor experiences a force perpendicular to its length and the external magnetic field. How does Fleming’s left-hand rule help us to find the direction of the force acting on the current-carrying conductor?

Take a small aluminium rod AB (of about 5 cm). Using two connecting wires suspend it horizontally from a stand,... View Article

Explain with the help of a labelled diagram the distribution of magnetic field due to a current through a circular loop. Why is it that if a current-carrying coil has n turns the field produced at any point is n times as large as that produced by a single turn?

The right-hand thumb rule is obeyed even in the current-carrying loop. This shows magnetic field lines are around the conducting... View Article

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