Science - Model Test Paper Class: X Set – 1

1. The question paper comprises of two sections A and B. You are to attempt both the sections.

2. All questions are compulsory.

3. There is no overall choice However, internal choice has been provided in all the three questions of five marks category. Only one option in such questions is to be attempted.

4. All questions of section A and all questions of section B are are to be attempted separately.

5. Questions 1 to 6 in section A and 17 to 19 in section B are short question. These carry one mark each.

6. Questions 7 to 10 in section A and 20 to 24 in section B are short answer type questions and carry two marks each.

7. Questions 11 to 14 in section A and 25 to 26 in section B are also short answer type questions and carry three marks each.

8. Questions 15 and 16 in section A and question 27 in section B are long answer type questions and carry five marks each.

(9) To view the answer, click on the Answer link alongside the Question.

Q 1)Give an example of an exothermic reaction. 1 Marks
Q 2)What is the cause of refraction of light when it travels from one medium to another? 1 Marks
Q 3)Name the chemical present in sting of an ant? 1 Marks
Q 4)The following table gives the values of refractive indices of a few media.

Use this table to give an example of:
(i) A medium pair so that light speeds up when it goes from one of these media to another.
(ii) A medium pair so that light bends towards normal when it travels from one of these media to another.

1 Marks
Q 5)Calculate the number of electrons constituting one coulomb of charge. 1 Marks

Q 6)Name a metal which is a good conductor of heat and a metal which is a poor conductor of heat. 1 Marks

Q 7)How was the Mendeleev’s periodic table different from the modern periodic table? 2 Marks

Q 8)Differentiate between alternating current and direct current. 2 Marks

Q 9)Give the composition and one use of following alloys:
(a) Solder
(b) Bronze 2 Marks

Q 10)Arrange the following substances in order of increasing acidity:
A with pH 1; B with pH 11; C with pH 7; D with pH 4 2 Marks

Q 11)Explain the following:
(a) Sky appears reddish near horizon at the time of sunrise and sunset.
(b) Stars appear to twinkle.
(c) A rainbow can be seen after a rain shower. 3 Marks

Q 12)Give the reaction and colour change observed when:
(i) Copper is heated in the presence of air.
(ii) Silver articles are exposed to air for sometime.
(iii) Carbon dioxide gas is passed through lime water. 3 Marks

Q 13)A concave mirror produces three times enlarged real image of an object placed at 10 cm in front of it. Find the focal length of the mirror. 3 Marks

Q 14)Atomic radii of the elements of the second period are given below:

(i) Arrange the above given elements in the pattern of a period in the Periodic Table.
(ii) How does the atomic size vary as we go from left to right in a period? Give reason for your answer.

3 Marks
Q 15)(a) What is an electric motor? Name the instruments where electric motor is used.
(b)What is the function of split rings in the electric motor?
(c) What is an armature?
(d)Why are the electric appliances connected in parallel in the domestic electric circuit? 5 Marks

Q 16)(a) What type of bonds are formed by the carbon?
(b) Which one should be used for cooking, an oil containing animal fats or a vegetable oil? Give reason to support your answer.
(c) Name the following compounds:
H
l
(i) CH₃-CH₂-C=O (ii) CH₃-CH=CH₂
(d) Which of the above compounds is an unsaturated compound?
(e) What is the general formula for the compound (ii)? 5 Marks

OR

An organic compound ‘A’ is widely used as a preservative in pickles and has a molecular formula C₂H₄O₂. This compound reacts with ethanol to form a sweet smelling compound ‘B.
(i) Identify the compound ‘A’
(ii) Write the chemical equation for its reaction with ethanol to form compound ‘B’.
(iii) Name the process.
(iv) What is compound ‘B’?
(v) Which gas is produced when compound ‘A’ reacts with washing soda?
write the chemical equation. 5 Marks

Q 17)Name the disease that is caused due to the deficiency of growth hormone in the childhood. 1 Marks

Q 18)Which out of the following, cow or a lion has the longer small intestine and why? 1 Marks

Q 19)What is the full form of: (a) CFCs (b) UNEP 1 Marks

Q 20)Choose a pair of homologous organs and a pair of analogous organs from the following:
Wings of a bird, wings of a bat, hands of a man 2 Marks

Q 21)Out of the two solar cookers, one painted black and the other painted white which of the two solar cookers will be more efficient and why? 2 Marks

Q 22)What is the difference between the manner in which movement takes place in ‘touch-me-not’ plant and the movement in our legs? 2 Marks

Q 23)Study the following food chains:
Food chain: wheat - rat - snake - hawk
To which of the two consumers, snake or hawk will more energy (percent) be available and why? 2 Marks

Q 24)A person is suffering from diabetes. Name the hormone which should be given to the person through injections. What is the role of this hormone in the body? 2 Marks

Q 25)Why are environmentalists insisting upon ‘sustainable natural resource management’? 3 Marks

Q 26)“Evolution is not equal to progress.” Explain it with an example. 3 Marks

Q 27)Describe Mendel’s experiment on the pea plant. What were his observations? What he concluded from the results? 5 Marks

OR

What are the traditional systems of water harvesting? Explain one of them with the help of a diagram. 5 Marks