[Latest] 20+ CBSE Science Sample Question Paper Class 10 | 2024

Last updated on July 14th, 2024 at 04:57 am

Science Sample Paper Class 10

Which of the following is the correct analysis of the reaction found in the device above?

(A) Formation of brown magnesium oxide powder.

(B) Colorless gas which turns lime water milky is evolved.

(C) The magnesium strip lights up and emits white light.

(D) Reddish brown gas with a smell of burning Sulphur has evolved.

2. Methane gas released from wastewater treatment plants can be used as fuel.

Which chemical equation represents the combination of methane to produce electricity?

(A) CH2 + CO2 → 202 +2H2O

(C) 202 + 2H20 → CO2 +CH4

(B) CH4 +202 → CO2 + 2H2O

(D) CO2 +202 → CH4 + 2H2O

3. The acid in tomatoes is:

(A) Formic acid

(B) Lactic acid

(C) Acetic acid

(D ) Oxalic acid

4. Builders used plaster of paris to create a layer on the interior walls of the building. Which property of Plaster of Paris powder makes it a suitable building material?

(A) It is light.

(C) It is easy to find in nature.

(B) It is white in color

(D) It hardens when mixed with water.

5. The electron dot structure of chlorine molecules is as follows:

6. Part of the homologous series is shown below.

C3H4, C4H6, C5H8

Which of these compounds is part of the series shown above? 

(A) C2H2

(B) C2H4

(C) C8H6

(D) C6H14

7. What is X in the reaction?

2Al + 3H₂O → Al2O3 + X

(A) Al     (B) H2     (C) O3   (D) AIH3

8. Small hair-like structures line the upper part of the human respiratory tract. These structures trap the dust particles, germs and chemicals entering the human body during breathing. Smoking is likely to cause infections in the respiratory tract. Which statement best explains the fact?

(A) Smoking destroys the hair-like structures.

(B) Smoking causes excessive growth of the hair-like structures.

(C) Smoking stimulates the hair-like structures to release harmful chemicals.

(D) Smoking makes the hair-like structures wet and they fail to trap dust particles.

9. The cerebellum in the brain controls the voluntary movements of the body. Which of the following functions is controlled by the cerebellum?

(A) Heartbeat

(B) Blinking of eyes

(C) Jumping from height 

(D) Watering of the mouth

10. A student who examined the embryo of a gram of seed listed the various parts of the embryo as follows: Testa, Micropyle, Cotyledon, Tegmen, Plumule, Rachcle.

On examining the list, the teacher commented that only three parts are correct. Select these three correct parts:

(A) Cotyledon, Testa, Plumule

(B) Cotyledon, Tegmen, Radicle

(C) Cotyledon, Plumule, Radicle

(D) Cotyledon, Micropyle, Plumule

11. A cross F between white-flowered pea (vv) and violet-flowered pea (VV) produces offspring; where the ratio of violet flowers (VV) and white flowers (vv) is as follows:

(A) 1:1

(C) 3:1

(B) 2 :1

(D) 1:3

12. A student wants to obtain an erect image of an object using a concave mirror of 10 cm focal length. What is the distance between the object and the mirror?

(A) Less than 10 cm

(B) 10 cm

(C) Between 10 cm and 20 cm

(D) More than 20 cm

13. The phenomena of light involved in the formation of a rainbow are:

(A) Refraction, dispersion and scattering.

(B) Refraction, reflection and dispersion.

(C) Refraction, dispersion and internal reflection.

(D) Reflection, dispersion and total internal reflection.

14. Select the option that matches the item given 

Options:

(A) (a )-(iii) , (b)-(i), (c)-(iv), (d)-(ii)

(B) (a)-(iii), (b)-(iv), (c) – (i), (d)-(ii)

(C) (a)-(iii), (b)-(iv), (c)-(ii), (d )- (i)

(D) (a)-(iii), (b)-(i), (c)-(ii), (d) )-(iv)

15. X in the given food chain is:

(A) Primary consumer

(B) Secondary consumer

(C) Tertiary consumer

(D) Producer

16. Which of these statements is incorrect about a balanced ecosystem?

(A) It is made up of interconnected food chains.

(B) It involves interdependence among living organisms and the environment.

(C) Animals are dependent on plants but plants are not dependent on animals.

(D) It involves communities made up of different populations of organisms.

Questions 17 to 20 have two statements: Assertion (A) and Reason (R). Answer this question by choosing the appropriate option below:

(A) A and R are true and K is true for A.

(B) A and R are both correct, and R is not a correct interpretation of A.

(C) A is true but R is false.

(D) A is false, but R is true.

17. Assertion (A): The reaction of quicklime with water is an exothermic reaction.

Reason (R): Quicklime reacts vigorously with water and releases a lot of heat.

18. Assertion (A): Characteristics of the parent plant can be preserved by vegetative reproduction.

Reason (R): Asexual reproduction involves only mitosis.

19. Assertion (A): A current carrying straight conductor experiences a force when placed perpendicular to the direction of a magnetic field.

Reason (R): The net charge on a current carrying conductor is always zero.

20. Assertion (A): Ecosystems consist of biotic and abiotic components.

Reason (R): Biotic and abiotic components play important roles for the sustenance of life and work independently

Section- B

21. Trupti mixes an aqueous solution of sodium sulfate (Na2SO4) and an aqueous solution of copper chloride (CUCl2). Will this lead to a double displacement reaction? Justify your answer.

22. Two green plants were stored in oxygen-free containers, one in the dark and the other in the sun. It has been observed that plants left in the dark do not survive longer. Explain the reasons for this observation.

23. Give two reasons why bile juice is considered an important secretion of the liver during digestion?

OR

What is another name for ’tissue fluid’? List two functions.

24. A light ray enters from medium A to medium B as shown in the figure.

(a) Which one of the two media is denser w.r.t. another medium? Justify your answer.

(b) If the speed of light in medium A is VA and B is VB, what is refractive. index of B with respect to A?

25. Priya has the same length of copper and aluminum wire. Can the electrical resistance of the two wires be the same? Justify your answer.

OR

(a) Name the poles P, Q, R and S of the magnets in the diagram below as “a” and “b”: 

(b) Based on the diagram, State the inference drawn about the direction of the magnetic field.

26. In the food chain below, vertical arrows represent energy lost to the environment and horizontal arrows represent energy transfer to the next trophic level.

Which of the three vertical arrows (A, C and E) and two horizontal lines (B and D) will represent greater energy transfer? Please give a reason for your answer.

Section – C

27. (a) Recommended safety procedures for diluting strong concentrated acids.

(b) Name the salt formed when sulfuric acid is added to sodium hydroxide and record its pH value.

(c) Dry HCl gas does not change the color of dry blue litmus paper. From where?

28. A reddish brown metal used in electrical wires that turns black when powered and heated. When hydrogen gas passes through this black material, it returns to its original color. Use this information to answer the following questions:

(a) Name the metal and the black substance that forms it.

(b) Write balanced chemical equations for the two reactions involved in the above information.

OR

Metal “M” reacts with dilute acid to release “G” gas. The same metal also releases “G” gas when it reacts with a base.

(a) Write the name of the gas “G”.

(b) How will you test the presence of this gas?

(c) Write the chemical equation for the reaction of the metal with (1) acid and (2) base.

29. List the glands and hormones secreted in humans in scary situations. List any two responses shown by our body when this hormone is secreted into the blood.

30. What are chromosomes? Explain how the stability of the DNA of the species is ensured in sexually reproducing

organisms.

31. The diagram shows an object O and its image I. Without actually drawing the ray diagram state the following:

(a ) Lens types (convergence-divergence )

(b) Name two optical devices used to obtain images like this.

(c) List three characteristics of the image formed if this lens is replaced by a concave mirror of focal length F and an object is placed at a distance F/2 in front of the mirror.

32. (a) List the factors on which the resistance of a uniform cylindrical conductor of a given material depends.

(b) The resistance of a wire of 0.01 cm radius is 10 11. If the resistivity of the wire is 50 x 10-⁸ Ω m, find the length of this wire.

33. (a) Why is alternating current (AC) thought to be better than direct current (DC) for long-distance transmission of electricity?

(b) How is the type of current used in household supply different from the one given by a battery of dry cells?

(c) How do electrical fuses protect circuits and equipment from damage caused by short circuits or overloads?

Section – D

34. (a) A compound “A” with a molecular formula of C2H4O2 reacts with a base to give salt and water. Identify A, state its nature and the name of the functional group it possesses. Write the chemical equation for the reaction involved.

(b) When the above-stated compound ‘A’ reacts with another compound ‘B’ having molecular formula C2H6O in the presence of an acid, a sweet smelling compound ‘C’ is formed.

(i) Identify ‘B’ and ‘C’.

(ii) State the role of acid in this reaction.

(iii) Write the chemical equation for the reaction involved.

OR

(a) Match the following pH values 1, 7, 10, 13 to the solutions given below:

(i) Milk of magnesia

(ii) Gastric juices

(iii) Brine

(iv) Aqueous sodium hydroxide.

(b) Amit and Rita decided to bake a cake and added baking soda to the cake batter. Explain with a balanced reaction, the role of the baking soda. Mention any other use of baking soda.

35. Give a reason for the following:

(a) During reproduction, inheritance of different proteins will lead to altered body designs.

(b) Fertilization cannot take place in flowers if pollination does not occur.

(c) All multicellular organisms cannot give rise to new individuals through fragmentation or regeneration.

(d) Vegetative propagation is practiced for growing only some types of plants.

(e) The parents and off-springs of organisms reproducing sexually have the same number of chromosomes.

OR

(a) Why is the use of iodised salt advisable? Name the disease caused due to deficiency of iodine in our diet and state its one symptom.

(b) How do nerve impulses travel in the body? Explain.

36. (a) Define the following terms in the context of spherical mirrors:

(i) Pole

(ii) Centre of curvature

(iii) Principal axis

(iv) Principal focus

(b) Draw ray diagrams to show the principal focus of a:

(i) Concave mirror

(ii) Convex mirror

(c) Consider the given diagram in which M is a mirror and P is an object and Q is its magnified image formed by the mirror.

State the type of the mirror M and one characteristic property of the image Q.

OR

An object is placed at a distance of 60 cm from a concave lens of a focal length 30 cm.

(a) Use the lens formula to find the distance of the image from the lens.

(b) List four characteristics of the image (nature, position, size, erect/inverted) formed by the lens in this case.

(c) Draw a ray diagram to justify your answer of part (b).

Section-E

37. Read the given passage and answer the questions that follow:

The pictures show the bonds formed by the sharing of electrons by the atoms of four different molecules.

(a) Out of these molecules – Hydrogen, carbon, nitrogen and oxygen, which has the strongest bond between its atoms? What is this type of bond between atoms known as?

(b) Which of these statements is true about carbon compounds? Write ‘Yes’ or ‘No’ for the correct response.

38. The most obvious outcome of the reproductive process is the generation of individuals of similar design, but in sexual reproduction they may not be exactly alike. Similarities and differences are marked. The rules of inheritance determine the process by which traits and characteristics are inherited.

Many experiments have been done to study the rules of inheritance.

(a) Why is the offspring of a human being is not a true copy of his parents in sexual reproduction?

(b) While performing experiments on inheritance in plants, what is the difference between F1 and F2 generation?

(c) Why do we say that variations are useful for the survival of a species over time?

or

(c) Study Mendel’s cross between two plants with a pair of contrasting characters.

RRYY × rryy

Round yellow wrinkled green

Found 4 connections in generation F. Which of these are new connections? Why do new traits that were not found in the 38. The most obvious outcome of the reproductive process is the generation of individuals of similar design, but in sexual reproduction they may not be exactly alike.

The resemblances as well as differences are marked. The rules of heredity determine the process by which traits and characteristics are reliably inherited. Many experiments have been done to study the rules of inheritance.

(a) Why is the offspring of a human being is not a true copy of his parents in sexual reproduction?

(b) While performing experiments on inheritance in plants, what is the difference between F1 and F2 generation?

(c) Why do we say that variations are useful for the survival of a species over time?

OR

(c) Study Mendel’s cross between two plants with a pair of contrasting characters.

RRYY               ×               rryy

Round Yellow        Wrinkled Green

He observed 4 types of combinations in F, generation. Which of these were new combinations? Why do new features which are not present in the parents, appear in F, generation?

39. Study the circuit shown in which three identical bulbs B, B, and B. are connected in parallel with a battery of 4.5V and answer the following questions.

(a) What will happen to the glow of the other two bulbs if bulb B. gets fused?

(b) Find the total resistance of the circuit.

(c) If the wattage of each bulb is 1.5 W, how much readings will the ammeter A show when all the three bulbs glow simultaneously.

OR

(c) How many resistors of 88 Ω are connected in parallel to carry 10 A current on a 220 V line?

Final Words

From the above article you have learnt cbse class 10 science sample paper. After solving science sample paper class 10 you will surely get good preparation for final exam.