CBSE Class 10 - Science (MCQs)
Q1. In which of the following, heat energy will be evolved?
(a) Electrolysis of water
(b) Dissolution of NH4Cl in water
(c) Burning of L.P.G.
(d) Decomposition of AgBr in the presence of sunlight
Q2. Sodium hydrogen carbonate when added to acetic acid evolves a gas. Which of the following statements is true about the gas evolved?
(i) It turns lime water milky.
(ii) It extinguishes a burning splinter.
(iii) It dissolves in a solution of sodium hydroxide.
(iv) It has a pungent odour.
(a) (i) and (ii)
(b) (i), (ii) and (iii)
(c) (ii), (iii) and (iv)
(d) (i) and (iv)
Q3. Which of the following salts has no water of crystallization?
(a) Copper sulphate
(b) Washing soda
(c) Baking soda
(d) Gypsum
Q4. Rain is called acid rain when its:
(a) pH falls below 5.6
(b) pH falls below 7
(c) pH falls below 6
(d) pH is above 7
Q5. The soap molecule has a -
(a) hydrophilic head and hydrophilic tail
(b) hydrophobic head and hydrophilic head
(c) hydrophobic head and hydrophobic tail
(d) hydrophilic head and hydrophobic tail
Q6. In which mode of nutrition an organism derives its food from the body of another living organism without killing it?
(a) Saprotrophic nutrition
(b) Parasitic nutrition
(c) Holozoic nutrition
(d) Autotrophic nutrition
Q7. During vigorous physical exercise, lactic acid is formed from glucose inside the muscle cells because
(a) there is lack of oxygen
(b) there is lack of water
(c) there is excess of carbon dioxide
(d) none of the above
Q8. Which of the following statements are true about brain?
i. The main thinking part of brain is hind brain
ii. Centers of hearing, smell, memory, sight etc. are located in fore brain
iii. Involuntary actions like salivation, vomiting, blood pressure are controlled by the medulla in the hind brain
iv. Cerebellum does not control posture and balance of the body
(a) (i) and (ii)
(b) (i), (ii) and (iii)
(c) (ii) and (iii)
(d) (iii) and (iv)
Q9. Identify the organism that can divide in only one plane
(a) Plasmodium
(b) Leishmania
(c) Amoeba
(d) Spirogyra
Q10. The fertilization of human egg by sperm takes place in
(a) Vagina
(b) Uterus
(c) Oviduct
(d) Ovary
Q11. In peas, a pure tall plant (TT) is crossed with a pure short plant (tt). The ratio of pure tall plants to pure short plants in F2 generation will be:
(a) 1 : 3
(b) 3 : 1
(c) 1 : 1
(d) 2 : 1
Q12. Amount of energy transferred from one trophic level to the next is
(a) 1%
(b) 10%
(c) 20%
(d) 2%
Q13. The velocity of light is maximum in a medium of
(a) glass
(b) water
(c) vacuum
(d) diamond
Q14. A student conducts an experiment using a convex lens of focal length 20 cm and an object of height 15 cm. He placed the object at 25 cm from the lens. Can the image be formed on a screen?
(a) yes, because a real image will be formed
(b) no, because a virtual image will be formed
(c) yes, because an erect image will be formed
(d) no because the image is inverted
Q15. The change in focal length of an eye lens is caused by the action of the
(a) pupil
(b) retina
(c) ciliary muscles
(d) iris
Q16. An electric kettle consumes 1kW of electric power when operated at 220V. The rating of fuse wire that must be used would be
(a) 1A
(b) 2A
(c) 4A
(d) 5A
Q17. Two resistors of resistances 2 Ω and 4 Ω when connected to a battery will have
(a) Same current flowing through them when connected in parallel
(b) Same current flowing through them when connected in series
(c) Same potential difference across them when connected in series
(d) None of these
Q18. Which of the following correctly describes the magnetic field near along straight current carrying wire?
(a) The field consists of straight lines perpendicular to the wire.
(b) The field consists of straight lines parallel to the wire.
(c) The field consists of radial lines originating from the wire.
(d) The field consists of concentric circles centered on the wire.
Q19. In an electrical circuit two resistors 2 Ω and 4 Ω respectively are connected in series to a 6 V battery. The heat dissipated by the 4 Ω resistor in 5 s will be
(a) 5 J
(b) 10 J
(c) 20 J
(d) 30 J
Answer:
1. (c) Burning of L.P.G.
2. (b) (i), (ii) and (iii)
3. (c) Baking soda
4. (a) pH falls below 5.6
5. (d) hydrophilic head and hydrophobic tail
6. (b) Parasitic nutrition
7. (a) there is lack of oxygen
8. (c) (ii) and (iii)
9. (b) Leishmania
10. (c) Oviduct
11. (c) 1 : 1
12. (b) 10%
13. (c) vacuum
14. (a) yes, because a real image will be formed
15. (c) ciliary muscles
16. (d) 5A
17. (b) Same current flowing through them when connected in series
18. (d) The field consists of concentric circles centered on the wire.
19. (c) 20 J
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