5 Marks Questions

Question 15 Marks

In the set up shown here, the bulb has lighted up.

Which of the following statement about liquid is/are correct?
I. Liquid is a distilled water.
II. Liquid is a tap water.
III. Liquid is a good conductor of electricity.
(a) III only
(b) II only
(c) I and III only
(d) II and III only

Answer

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Question 25 Marks

Draw the symbols in your notebook to represent the following components of electrical circuits: connecting wires, switch in the OFF position, bulb, cell, switch in the ON position and battery.

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Question 35 Marks

A student performs an experiment where he uses a heating coil to heat the water as shown in the figure. The initial temperature of the water is measured as $10^{\circ} C$. After switching it ON for 5 min, the student records the temperature of the water as $18^{\circ} C$.

The water is allowed to return back to its initial temperature. The activity is then repeated with another heating coil having half the length of the original heating coil. He notices that after 5 min, the temperature of the water reads $14^{\circ} C$. Which statement can be concluded based on the activity?
(a) Reading on thermometer reduces with time.
(b) Temperature of water drops with every repetition.
(c) Length of the material affects the amount of heating.
(d) Temperature of the water increases after a certain period of time.

Answer

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Question 45 Marks

Geeta had setup the experiment as shown in figure.

She found out that the steel nail in setup X had attracted less iron pins than the steel nail in setup Y. What could be the reason for this?

Answer

As clearly shown in the figure, the strength of battery used in setup Y (20 V) is more than that used in setup X (15 V). So, more current flows in setup Y, that is why setup Y attracts more nails.

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Question 55 Marks

(i) As shown in the above picture, why does the circuit acquire magnetism?
(ii) How can the magnetic strength of an electromagnet can be increased?
(iii) Name two commercially used devices that work on electromagnetism.

Answer

(i) The circuit acquires magnetism due to the magnetic effect of electric current, which states that a current carrying wire behaves as a magnet.
(ii) The magnetic strength of the electromagnet can be increased by
(a) increasing number of turns in the coil.
(b) increasing the current passing through the coil.
(iii) Electric bell and loudspeaker.

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Science 5 Marks Questions

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