CBSE EXAMINATION PAPER-2024
SCIENCE
(Solved)
General Instructions :
Read the following instructions carefully and follow them :
- This question paper contains 22 questions. All questions are compulsory.
- This question paper is divided into 5 sections.
- Section A – questions number 1 to 2 are case based questions
- Section B – questions number 3 to 9 are multiple choice questions
- Section C – questions number 10 to 17 are very short answer
- Section D – questions number 18 to 20 are short answer
- Section E – questions number 21 to 22 are long answer
- There is no overall choice given in the question paper. However, an internal choice has been provided in few questions.
- Use of calculator is NOT allowed.
Section A
(1) Name the glands present in the buccal cavity and write the components of food on which the secretion of these glands act upon.
[1 Marks](2) Two organs have a sphincter muscle at their exit. Name them.
(3) "Bile juice does not contain any enzyme, yet it has important roles in digestion." Justify the statement.
(4) What will happen if: (i) mucus is not secreted by the gastric glands. (ii) Villi are absent in the small intestine.
(1) (a) State what happens when (i) key 𝐾₁ is closed. (ii) key 𝐾₂ is closed.
[1 Marks](2) Find the current drawn by the bulb B when it glows.
(3) What would happen to the glow of all the bulbs in the circuit when keys K₁ and K₂ both are closed and the bulb C suddenly get fused? Give reason to justify your answer.
(4) Calculate
(i) the resistance of bulb B, and
(ii) total resistance of the combination of four bulbs B, C, D and E.
Section B
Select a pair of natural indicator from the following:
Consider the following Chemical equation: 𝑎Al₂O₃+𝑏HCl→𝑐AlCl₃+𝑑H₂O In order to balance this chemical equation, the values of a, b, c and d must be
Part(s) of a flower which attracts insects for pollination is (are)
The Phenomena of light involved in the formation of a rainbow in the sky are
A food chain will be more advantageous in terms of energy if it has
Section C
Draw a labelled diagram to show the pattern of magnetic field lines produced due to a current carrying straight conductor. Mark on it the direction of current in the conductor and the direction of magnetic field lines.
Name the device used to magnetise a piece of magnetic material. Draw a labelled diagram to show the arrangement used for the magnetisation of a cylinder made of soft iron.
Section D
Section E
Name and state in brief the process which is used to prepare sodium hydroxide from sodium chloride. In this process along with the main product two gases 'X' and 'Y' are also given off at the two electrodes. Name 'X' and 'Y' specifying the name of their respective electrode at which each gas is obtained. One of these gases when reacts with dry calcium hydroxide produces a compound 'Z' which is widely used in water treatment plants and textile industries. Name 'Z' and write chemical equation for the reaction involved in its formation.
Draw a ray diagram to show the path of the reflected ray in each of the following cases:
A ray of light incident on a convex mirror
(1) parallel to its principal axis, and
(2) is directed towards its principal focus
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