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Exam study book Science of NCERT - ISBN: 9788174506542 (Science brahmastra)
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SCIENCE BRAHMASTRA TEST
Class 10 - Science
Time Allowed: 3 hours Maximum Marks: 80
Section A
1. Which of the statements about the reaction below are incorrect? [1]
2PbO(s) + C(s) → 2Pb(s) + CO2(g)
a. Lead is getting reduced.
b. Carbon dioxide is getting oxidised.
c. Carbon is getting oxidized.
d. Lead oxide is getting reduced.
a) All of these b) (a) and (c)
c) (a) and (b) d) (a), (b) and (c)
2. A solution turns red litmus blue, its pH is likely to be [1]
a) 4 b) 1
c) 10 d) 5
3. A solution reacts with crushed egg shells to give a gas that turns lime water milky. The solution contains [1]
a) LiCl b) KCl
c) HCl d) NaCl
4. Which of the following pairs will give displacement reactions? [1]
a) FeSO4 solution and silver metal b) AgNO3 solution and copper metal
c) NaCl solution and copper metal d) MgCl2 solution and aluminum metal
5. Which of the following methods is suitable for preventing an iron frying pan from rusting? [1]
a) Applying paint b) Applying a coating of zinc
c) Applying grease d) All of these
6. While cooking if the bottom of the vessel is getting blackened on the outside, it means that: [1]
a) The fuel is burning completely. b) The food is not cooked completely.
c) The fuel is not burning completely. d) The fuel is wet.
7. The kidneys in human beings are a part of the system for [1]
a) respiration b) excretion
c) nutrition d) transportation
8. The xylem in plants are responsible for: [1]
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, a) transport of amino acids b) transport of oxygen
c) transport of food d) transport of water
9. The autotrophic mode of nutrition requires [1]
a) Sunlight b) Carbon- dioxide and water
c) All of these d) Chlorophyll
10. The breakdown of pyruvate to give carbon dioxide, water and energy takes place in: [1]
a) mitochondria b) chloroplast
c) cytoplasm d) nucleus
11. Which of the following is a plant hormone? [1]
a) Oestrogen b) Thyroxin
c) Insulin d) Cytokinin
12. The gap between two neurons is called a: [1]
a) impulse b) dendrite
c) axon d) synapse
13. The brain is responsible for: [1]
a) thinking b) balancing the body
c) regulating the heartbeat d) All of these
14. The human eye can focus on objects at different distances by adjusting the focal length of the eye lens. This is [1]
due to
a) Presbyopia b) Near-sightedness
c) Accommodation d) Far-sightedness
15. An electron enters a magnetic field at right angles to it, as shown in Fig. The direction of force acting on the [1]
electron will be
a) into the page. b) to the right.
c) out of the page. d) to the left.
16. The image formed by a concave mirror is observed to be virtual, erect and larger than the object. Where should [1]
be the position of the object?
a) Between the principal focus and the centre b) Beyond the centre of curvature
of curvature
c) At the centre of curvature d) Between the pole of the mirror and its
principal focus.
17. No matter how far you stand from a mirror, your image appears erect. The mirror is likely to be: [1]
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