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Science 50 Mcqs
1. The contraction and expansion movement of the walls of the food pipe is called
A. Transpiration
B. Translocation
C. Digestion
D. Peristaltic movement
View Answer
D
2. Which of the following reactions is used in black-and-white photography?
A. Combination Reaction
B. Decomposition Reaction
C. Displacement reaction
D. Oxidation reaction
View Answer
B
3. Which of the following shows an oxidation reaction?
A. Gain of oxygen
B. Loss of oxygen
C. Gain of hydrogen
D. None of the above
View Answer
A
4. The respiratory pigment in human beings is
A. Mitochondria
B. Heamoglobin
C. Chlorophyll
D. Carotene
View Answer
B
5. When hydrogen sulphide gas is passed through blue solution of copper sulphate, a black colour copper sulphide is obtained and the sulphuric acid so formed remains the solution. The reaction is an example of a:
A. Combination reaction
B. Displacement reaction
C. Decomposition reaction
D. Double Displacement reaction
View Answer
D
6. What is the function of pituitary gland?
A. to stimulate growth in all organs
B. to develop sex organs in males
C. to regulate sugar and salt levels in the body
D. To initiate metabolism in the body
View Answer
A
7. One of the constitute of baking powder is sodium hydrogen carbonate, the other constitute is?
A. Acetic acid
B. Hydrochloric acid
C. Tartaric acid
D. Sulphuric acid
View Answer
C
8. What is the chemical name for chloride of lime?
A. Calcium oxide
B. Sodium hydroxide
C. Calcium hydroxide
D. Calcium oxychloride
View Answer
D
9. A charge of 100 C flows through a bulb in 5 minutes. How much current is flowing through the bulb?
A. 500 A
B. 100 A
C. 20A
D. 0.3 A
View Answer
D
10.Two bulbs of 100 w and 40 w are connected in series. the current through the 100 w bulb is 1 A. the current through the 40 w bulb will be?
A.0.4 A
B. 0.6 A
C. 0.8 A
D. 1 A
View Answer
D
11. What does the tangent at any point on magnetic field lines indicate?
A. Direction of the force
B. Direction of current
C. Direction of induced current
D. Direction of magnetic field
View Answer
D
12. The resistance of a resistor is reduced to half of its initial value. In doing so, if potential of the circuit remain unchanged, the heating effects in the resistor will become?
A.two time
B. half
C. one-fourth
D. four times
View Answer
A
13. An aqueous solution turns red litmus solution blue. Excess addition of which of the following solution would reverse the change?
A. Baking powder
B. Ammonium hydroxide solution
C. Hydrochloric acid
D. Lime
View Answer
C
14. Which of the following terms does not represent electrical power in a circuit?
A.V²/R
B. VI
C. IR²
D. I²R
View Answer
C
15. The ratio of the number of chromosomes in a human zygote and a human sperm is?
A. 2:1
B. 1:1
C. 3:1
D.1:3
View Answer
A
16.In the given redox reaction identify the correct statements
ZnO + C → Zn + CO
(i) C is a reducing agent
(ii) ZnO is an oxidising agent
(iii)Zn is oxidated to ZnO and CO is reduced to C
(iv)ZnO is reduced to Zn and C is oxidised to CO
A. (i) and (ii)
B. (i), (ii) and (iii)
C. (i), (ii) and (iv)
D.Only (iv)
View Answer
B
17.Which metal is displaced when lead is put in the solution of copper chloride and silver chloride?
A. Lead
B. Copper
C. Silver
D.Copper and silver both
View Answer
D
18.Chlorine reacts with saturated hydrocarbons at room temperature in the
A. absence of sunlight
B. presence of sunlight
C. presence of water
D.presence of hydrochloric acid
View Answer
B
19. A sample of soil is mixed with water and allowed to settle. The clear supernatant solution turns the pH paper yellowish-orange. Which of the following would change the colour of this pH paper to greenish-blues?
A. Lemon juice
B. vinegar
C. Common salt
D. An antacid
View Answer
D
20.Fruits are formed from the
A. stamen
B. stigma
C. ovary
D. ovule
View Answer
C
21. Which of the following metal is protected by a layer of its oxide?
A. Copper
B. Aluminium
C. Sodium
D. Iron
View Answer
B
22. In pea plants. Yellow seeds are dominant to green seeds, if a heterozygous yellow-seeded plant is crossed with a green seeded plant, what ratio of yellow and green plant would you expect in the F1 generation?
A. 9:1
B. 3:1
C. 1:3
D. 50:50
View Answer
D
23. Ethane on complete combustion gave CO2 and water. It shows that the results are in the accordance with the law of conservation of mass. Then the coefficient of oxygen is equal to?
A. 7/2
B. 3/2
C. 5/2
D. 9/2
View Answer
A
24. A student determines the focal length of a device X, by focusing the image of a far off object on the screen positioned as shown in figure. The device X is a:
A. Convex lens
B. Concave lens
C. Convex mirror.
D. Concave mirror
View Answer
D
25. A ray of light is incident on a glass slab at angle of incidence of 60°. If the angle of refraction be 32.7°. What will be refractive index of glass assuming sin 60°=0.866 and sin32.7°= 0.54?
A. 1.603
B. 1.540
C. 1.327
D. None of these
