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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 Milk is an animal product and dietary fibre is a plant product. Hence, milk does not have dietary fibre. Dietary fibre is an essential... 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 with white flesh. (b) I T R U F : FRUIT Fruit is the... 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 rocks and seawater. ii) Water- It is... 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 produced honey in their home which... 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 are known as... 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 (a) cow, milk, butter. It is related as cow gives milk and butter can be obtained from milk. (b) hen, meat,... 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) Banana has three edible parts that are fruit, flower, and stem. Pumpkin has two edible parts, which are flower and fruit. In... 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) Cow and sheep are the sources of milk for human beings.Cows, buffaloes, sheep, goat, and camels are a great source of milk.... View Article

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

c) Nectar Bees collect nectar from different flowers and convert it into honey and then they store this honey as food. Nectar is the sweet... 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) Both human beings and cockroaches are omnivores as the feed upon plants or plant products as well on other organisms. Goat... 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 rating is used with 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. Electric... 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?

A current-carrying conductor, when placed in a magnetic field, experiences a force. If the direction of the field and that of the current are... 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, as shown in Fig. Place a strong... 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 wire. But the... View Article

With the help of a labelled circuit diagram illustrating the pattern of field lines of the magnetic field around a current-carrying straight long conducting wire. How is the right-hand thumb rule useful to find the direction of the magnetic field associated with a current-carrying conductor?

Right-hand thumb rule states that if a current-carrying straight conductor is held in the right hand with the thumb pointing towards the... View Article

Why does a magnetic compass needle pointing North and South in the absence of a nearby magnet get deflected when a bar magnet or a current-carrying loop is brought near it. Describe some salient features of magnetic lines of field concept.

Current carrying loops act as bar magnets which have associated lines of the field. This changes the existing earth’s magnetic field and a... View Article

What is the role of fuse, used in series with any electrical appliance? Why should a fuse with defined rating not be replaced by one with a larger rating?

Fuse is used for protecting appliances due to short-circuiting or overloading. The fuse is rated for a certain maximum current and blows off when... View Article

What is the difference between a direct current and an alternating current? How many times does AC used in India change direction in one second?

b) 100 times Direct current always flows in one direction but the alternating current reverses its direction periodically. The frequency of AC... View Article

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