CBSE EXAMINATION PAPER-2024
SCIENCE
(Solved)
General Instructions :
Read the following instructions carefully and follow them :
- This question paper contains 24 questions. All questions are compulsory.
- This question paper is divided into 4 sections.
- Section A – questions number 1 to 2 are case based questions
- Section B – questions number 3 to 14 are multiple choice questions
- Section C – questions number 15 to 20 are very short answer
- Section D – questions number 21 to 24 are short 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
Mendel worked out the rules of heredity by working on garden pea using a number of visible contrasting characters. He conducted several experiments by making a cross with one or two pairs of contrasting characters of pea plant. On the basis of his observations he gave some interpretations which helped to study the mechanism of inheritance.
(1) When Mendel crossed pea plants with pure tall and pure short characteristics to produce F₁ progeny, which two observations were made by him in F₁ plants?
(2) Write one difference between dominant and recessive trait.
[1 Marks](3) In a cross with two pairs of contrasting characters Mendel observed 4 types of combinations in F₂ generation. By which method did he obtain F₂ generation? Write the ratio of the parental combinations obtained and what conclusions were drawn from this experiment.
[2 Marks]
(4) Justify the statement: "It is possible that a trait is inherited but may not be expressed."
(1) List two properties of the image formed in case 2.
[1 Marks](2) In which one of the above cases will the mirror form a diminished image of the object? Justify your answer.
[1 Marks](3) What is the nature and size of the image formed by mirror C? Draw a ray diagram to justify your answer.
[2 Marks](4) An object is placed at a distance of 18 cm from the pole of a concave mirror of focal length 12 cm. Find the position of the image formed in this case.
Section B
A metal and a non-metal that exists in liquid state at the room temperature are respectively:
Carbon compounds:
(i) are good conductors of electricity.
(ii) are bad conductors of electricity.
(iii) have strong forces of attraction between their molecules.
(iv) have weak forces of attraction between their molecules.
The correct statements are:
Consider the following compounds:
FeSO₄, CuSO₄, CaSO₄, Na₂CO₃
The compound having maximum number of waters of crystallization in its crystalline form in one molecule is:
MnO₂+4HCl→MnCl₂+2H₂O+ Cl₂.
The reaction given above is a redox reaction because in this case:
Chromosomes:
(i) carry hereditary information from parents to the next generation.
(ii) are thread-like structures located inside the nucleus of an animal cell.
(iii) always exist in pairs in human reproductive cells.
(iv) are involved in the process of cell division. The correct statements are:
Section C
How is the movement of leaves of a sensitive plant different from the downward movement of the roots?
There is a hormone which regulates carbohydrate, protein and fat metabolism in our body. Name the hormone and the gland which secretes it. Why is it important for us to have iodised salt in our diet?
In the given circuit calculate the power consumed in watts in the resistor of 2 Ω:
(i) Two magnetic field lines do not intersect each other. Why?
(ii) How is a uniform magnetic field in a given region represented? Draw a diagram in support of your answer.
Section D
(i) The pH of a sample of tomato juice is 4.6. How is this juice likely to be in taste? Give reason to justify your answer.
(ii) How do we differentiate between a strong acid and a weak base in terms of ion-formation in aqueous solutions ?
(iii) The acid rain can make the survival of aquatic animals difficult. How?
A gas 'X' which is a deadly poison is found at the higher levels of the atmosphere and performs an essential function.
Name the gas and write the function performed by this gas in the atmosphere. Which chemical is linked to the decrease in the level of this gas? What measures have been taken by an international organization to check the depletion of the layer containing this gas?
Name and state the rule to determine the direction of a:
(i) magnetic field produced around a current carrying straight conductor.
(ii) force experienced by a current carrying straight conductor placed in a magnetic field which is perpendicular to it.
Other Years — SCIENCE