SCIENCE BOOK PAPERS TEST 5
Student’s Name:____________Admission No.______Roll No._____Section:______
Paper: Science Book Papers Class: 8 Time Allowed: One Hour Marks: 25 
Checked by:_______________ Rechecked by:_____________ Sign Invigilator:_____________
Q1. Circle the correct answer. (10)
Choose the correct answer of the multiple choice questions. (2×25)
1. In a chemical equation, the number written in front of the chemical formula is:
(a) product (b) coefficient (c) equation (d) reactant
2. What type of chemical reaction absorbs energy and requires energy to start?
(a) endothermic (b) exothermic (c) addition (d) decomposition
3. In the following unbalanced chemical reaction, which components are classified as the reactants?
C7H16+ O2 CO2+ H2O
(a) C7H16 and O2 (b) C7H16 and H2 O (c) CO2 and H2O (d) C7H16 and CO2
4. The chemical equation:
2H2+ O2 H2O : represents a:
(a) double-replacement reaction
(b) synthesis reaction
(c) decomposition reaction
(d) single-replacement reaction
5. 2Mg + O2 ……………………………..
(a) Mg2O (b) MgO2 (c) Mg2O2 (d) 2MgO
6. The following reaction is:
2H2 O + Heat 2H2 + O2
(a) an exothermic reaction
(b) an endothermic reaction
(c) a simple reaction
(d) a complex reaction
7. Which of the following is the pH of a strong alkali?
(a) pH 5 (b) pH 7 (c) pH 9 (d) pH14
8. Which of the following is the pH of a strong acid?
(a) pH1 (b) pH2 (c) pH9 (d) pH8
9. Which of the following is the most accurate way of showing neutralization?
(a) acid + base neutral solution
(b) acid + base salt + water
(c) acid + base sodium chloride + hydrogen
(d) There is no reaction between acids and alkalis.
10. Sodium hydroxide and calcium hydroxide are:
(a) alkalis (b) acids (c) phosphates (d) indicators
11. Certain materials can act as indicators because they change:
(a) acidity (b) colour (c) concentration (d) taste
12. Which chemical is also known as the king of chemicals?
(a) sodium chloride (b) hydrochloric acid (c) sulphuric acid (d) calcium hydroxide
13. The unit of force is:
(a) pascal (b) newton (c) farad (d) ampere
14. Cutting tools have blades with one edge very sharp because:
(a) the sharp edge has less area of contact and applies lesser pressure
(b) the sharp edge has large area of contact and applies greater pressure
(c) the sharp edge has less area of contact and applies no pressure
(d) the sharp edge has less area of contact and applies greater pressure
15. When two equal forces act on a body, in opposite directions, the net force is equal to:
(a) the sum of the individual forces
(b) zero
(c) difference between the two forces
(d) an individual force
16. When pressure is applied on a liquid, it getstransmitted in all directions .This law is given by:
(a) Newton (b) Edison (c) Pascal (d) James Watt
17. On what principle, hydraulic disk brakes based on?
(a) Pascal’s (b) Newton’s (c) Ampere’s (d) Faraday’s
18. Tiny particles suspended in the air are known as:
(a) aerosols (b) pneumatics (c) hydraulics (d) brownian
19. A comparison of a certain quantity with a standard is called:
(a) System International (b) measurement (c) description (d) evaporation
20. Centi- is the part of a unit:
(a) one thousand (b) one thousandth (c) one hundredth (d) one tenth
21. To convert from smaller to larger units, we:
(a) divide (b) multiply (c) add (d) subtract
22. To obtain accurate reading on a metre rod:
(a) the eye must be placed horizontally above the mark
(b) the eye must be placed vertically above the mark
(c) the eye must be placed horizontally below the mark
(d) the eye must be placed vertically below the mark
23. 1 litre is equal to:
(a) 100 millilitres (mL) (b) 1000 millilitres (mL) (c) 10 grams (g) (d) 10 millilitres (mL)
24. The space occupied by matter is called its:
(a) mass (b) volume (c) weight (d) temperature
25. The measuring unit of mass is:
(a) metre (m) (b) millimetre (mm) (c) kilogram (d) cubic centimetre (cm3)
1. In a chemical equation, the number written in front of the chemical formula is:
(a) product (b) coefficient (c) equation (d) reactant
2. What type of chemical reaction absorbs energy and requires energy to start?
(a) endothermic (b) exothermic (c) addition (d) decomposition
3. In the following unbalanced chemical reaction, which components are classified as the reactants?
C7H16+ O2 CO2+ H2O
(a) C7H16 and O2 (b) C7H16 and H2 O (c) CO2 and H2O (d) C7H16 and CO2
4. The chemical equation:
2H2+ O2 H2O : represents a:
(a) double-replacement reaction
(b) synthesis reaction
(c) decomposition reaction
(d) single-replacement reaction
5. 2Mg + O2 ……………………………..
(a) Mg2O (b) MgO2 (c) Mg2O2 (d) 2MgO
6. The following reaction is:
2H2 O + Heat 2H2 + O2
(a) an exothermic reaction
(b) an endothermic reaction
(c) a simple reaction
(d) a complex reaction
7. Which of the following is the pH of a strong alkali?
(a) pH 5 (b) pH 7 (c) pH 9 (d) pH14
8. Which of the following is the pH of a strong acid?
(a) pH1 (b) pH2 (c) pH9 (d) pH8
9. Which of the following is the most accurate way of showing neutralization?
(a) acid + base neutral solution
(b) acid + base salt + water
(c) acid + base sodium chloride + hydrogen
(d) There is no reaction between acids and alkalis.
10. Sodium hydroxide and calcium hydroxide are:
(a) alkalis (b) acids (c) phosphates (d) indicators
11. Certain materials can act as indicators because they change:
(a) acidity (b) colour (c) concentration (d) taste
12. Which chemical is also known as the king of chemicals?
(a) sodium chloride (b) hydrochloric acid (c) sulphuric acid (d) calcium hydroxide
13. The unit of force is:
(a) pascal (b) newton (c) farad (d) ampere
14. Cutting tools have blades with one edge very sharp because:
(a) the sharp edge has less area of contact and applies lesser pressure
(b) the sharp edge has large area of contact and applies greater pressure
(c) the sharp edge has less area of contact and applies no pressure
(d) the sharp edge has less area of contact and applies greater pressure
15. When two equal forces act on a body, in opposite directions, the net force is equal to:
(a) the sum of the individual forces
(b) zero
(c) difference between the two forces
(d) an individual force
16. When pressure is applied on a liquid, it getstransmitted in all directions .This law is given by:
(a) Newton (b) Edison (c) Pascal (d) James Watt
17. On what principle, hydraulic disk brakes based on?
(a) Pascal’s (b) Newton’s (c) Ampere’s (d) Faraday’s
18. Tiny particles suspended in the air are known as:
(a) aerosols (b) pneumatics (c) hydraulics (d) brownian
19. A comparison of a certain quantity with a standard is called:
(a) System International (b) measurement (c) description (d) evaporation
20. Centi- is the part of a unit:
(a) one thousand (b) one thousandth (c) one hundredth (d) one tenth
21. To convert from smaller to larger units, we:
(a) divide (b) multiply (c) add (d) subtract
22. To obtain accurate reading on a metre rod:
(a) the eye must be placed horizontally above the mark
(b) the eye must be placed vertically above the mark
(c) the eye must be placed horizontally below the mark
(d) the eye must be placed vertically below the mark
23. 1 litre is equal to:
(a) 100 millilitres (mL) (b) 1000 millilitres (mL) (c) 10 grams (g) (d) 10 millilitres (mL)
24. The space occupied by matter is called its:
(a) mass (b) volume (c) weight (d) temperature
25. The measuring unit of mass is:
(a) metre (m) (b) millimetre (mm) (c) kilogram (d) cubic centimetre (cm3)
Q2. Fill in the blanks. (2×5)
i. Chemical changes are usually called _________.
ii. The pH of alkalis is less than _________.
iii. The use of a liquid to transmit pressure from one
location to the other _________.
iv. The curved surface of a liquid _________.
v. The unit ‘litre’ is used to measure _______.
i. Chemical changes are usually called _________.
ii. The pH of alkalis is less than _________.
iii. The use of a liquid to transmit pressure from one
location to the other _________.
iv. The curved surface of a liquid _________.
v. The unit ‘litre’ is used to measure _______.
Q3.Answer the following questions. (4×10)
27. (a) What are reactants and products?
(b) Explain the rearrangement of atoms in chemicalreactions with examples.
28. (a) What is neutralization?
(b) How are salts formed? Give examples and name a few salts.
29. (a) Why can horses not move easily in sandy soil but camels can?
(b) Write notes on:
(i) Pneumatics (ii) Aerosols
30. (a) What do you mean by prefixes?
(b) Write a note on time and its measurement.
27. (a) What are reactants and products?
(b) Explain the rearrangement of atoms in chemicalreactions with examples.
28. (a) What is neutralization?
(b) How are salts formed? Give examples and name a few salts.
29. (a) Why can horses not move easily in sandy soil but camels can?
(b) Write notes on:
(i) Pneumatics (ii) Aerosols
30. (a) What do you mean by prefixes?
(b) Write a note on time and its measurement.
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