General Science MCQs for RRB NTPC/ JE/ Group D/ ALP
1. The rate of change of velocity is called :
(a) Force
(b) Momentum
(c) Acceleration
(d) Speed
2. Sound is a :
(a) Tidal wave
(b) Mechanical wave
(c) Surface wave
(d) Electromagnetic wave
3. If a body is whirled in a circle the work done on it ......
(a) is negative
(b) is zero
(c) cannot be determined
(d) is positive
4. Metals can be given different shapes according to our needs because they possess the properties of :
(a) Malleability and ductility
(b) Ductility and conductivity
(c) Malleability and sonorosity
(d) Conductivity and sonorosity
5. What is the Centre of Curvature of a spherical mirror ?
(a) It is a point from which the rays of light appear to be coming from on the principal axis of a convex mirror.
(b) It is the centre of a hollow sphere of which the spherical mirror is a part.
(c) It is the midpoint of a spherical mirror.
(d) It is the point on the principal axis through which rays of light parallel to the principal axis pass after reflection.
6. The motile germ cell is called a/an :
(a) Isogamete
(b) Gamete
(c) Male gamete
(d) Female gamete
7. Dwarfness can be controlled by treating plants with :
(a) Auxin
(b) Cytokinin
(c) Gibberellic acid
(d) Ethylene
8. If the initial velocity of a car is 5 m/s, and the final velocity is 10 m/s in 5 s, then the acceleration is ......
(a) 10 m/s²
(b) 5 m/s²
(c) 0.1 m/s²
(d) 1 m/s²
9. Which one of the following is commonly used as an indicator to measure the exact pH ?
(a) Eosin
(b) Universal indicator
(c) Litmus
(d) Phenolphthalein
10. Aluminium oxide is ......... in nature.
(a) acidic
(b) basic
(c) neutral
(d) amphoteric
11. Which of the following metals is a liquid at room temperature ?
(a) Lithium
(b) Calcium
(c) Mercury
(d) Sodium
12. Which of the following solutions in alkaline ?
(a) [H⁺] = 1 × 10⁻⁸ Mol/l
(b) [H⁺] = 1 × 10⁻⁷ Mol/l
(c) [H⁺] > 1 × 10⁻⁷ Mol/l
(d) [H⁺] < 1 × 10⁻⁷ Mol/l
13. What is the atomicity of Phosphorus?
(a) Mono-atomic
(b) Di-atomic
(c) Poly-atomic
(d) Tetra-atomic
14. The egg is carried from the ovary to the womb through :
(a) the vas deferens
(b) the oviduct
(c) the cervix
(d) the uterus
15. Which of the following plant tissues is capable of cell division ?
(a) Meristem
(b) Sclerenchyma
(c) Xylem
(d) Parenchyma
16. Which of the following classifications is based on atomic numbers ?
(a) Modern Periodic Table
(b) Dobereiner's Law of Triads
(c) Newlands Law of Octaves
(d) Mendeleev's Periodic Table
17. Which of the following is used in the preparation of tincture iodine, cough syrup and many tonics ?
(a) Ethanoic acid
(b) Ethanol
(c) Methanol
(d) Acetic acid
18. The number of electrons that can be accommodated in the M shell is :
(a) 32
(b) 18
(c) 8
(d) 2
19. Which part of the human reproductive system helps the embryo get its nutrition from the mother's blood ?
(a) Uterus
(b) Cervix
(c) Placenta
(d) Fallopian tube
20. An object having a mass 'm' moving with a velocity 'v' possesses a kinetic energy 'K'. If its velocity is doubled, its kinetic energy will become :
(a) 4 K
(b) K/4
(c) K/2
(d) 2 K
21. What is the principal focus of a spherical mirror ?
(a) It is a point from which the rays of light appear to be coming from on the principal axis of a convex mirror.
(b) It is the point on the principal axis through which rays of light parallel to the principal axis pass after reflection or appear to be arising from this point on the principal axis.
(c) It is the centre of a hollow sphere of which the spherical mirror is a part.
(d) It is the midpoint of a spherical mirror.
22. The mass of one molecule of oxygen is ......
(a) 2.3 × 10⁻²³ g
(b) 3.3 × 10⁻²³ g
(c) 5.3 × 10⁻²³ g
(d) 4.3 × 10⁻²³ g
23. Which of the following metals reacts vigorously with cold water ?
(a) Iron
(b) Aluminium
(c) Zinc
(d) Potassium
Answers below page
Here are the answers for all 23 MCQs:
1. (c) Acceleration
Rate of change of velocity = acceleration.
2. (b) Mechanical wave
Sound needs a medium to travel, so it’s a mechanical wave.
3. (b) is zero
In circular motion, force is towards center but displacement is tangential. Angle = 90°, so Work = Fd cos90° = 0.
4. (a) Malleability and ductility
Malleability = beaten into sheets, Ductility = drawn into wires.
5. (b) It is the centre of a hollow sphere of which the spherical mirror is a part
Definition of Centre of Curvature.
6. (c) Male gamete
Sperm is the motile germ cell.
7. (c) Gibberellic acid
Gibberellins promote stem elongation and remove genetic dwarfness.
8. (d) 1 m/s²
a = (v-u)/t = (10-5)/5 = 5/5 = 1 m/s²
9. (b) Universal indicator
Gives exact pH value with color chart. Litmus only tells acid/base.
10. (d) amphoteric
Al₂O₃ reacts with both acids and bases.
11. (c) Mercury
Hg is the only metal liquid at room temp.
12. (d) [H⁺] < 1 × 10⁻⁷ Mol/l
pH > 7 means alkaline, so H⁺ concentration < 10⁻⁷.
13. (d) Tetra-atomic
Phosphorus exists as P₄, so atomicity = 4.
14. (b) the oviduct
Also called Fallopian tube, carries egg from ovary to uterus.
15. (a) Meristem
Meristematic tissue has actively dividing cells.
16. (a) Modern Periodic Table
Modern Periodic Law: Properties are periodic functions of atomic numbers.
17. (b) Ethanol
Ethanol/Ethyl alcohol is used as solvent in tincture iodine, cough syrups.
18. (b) 18
M shell = 3rd shell. Max electrons = 2n² = 2×3² = 18.
19. (c) Placenta
Placenta connects embryo to mother’s blood for nutrition, gas exchange.
20. (a) 4 K
KE = ½mv². If v → 2v, then KE = ½m(2v)² = 4×½mv² = 4K.
21. (b) It is the point on the principal axis through which rays of light parallel to the principal axis pass after reflection or appear to be arising from this point on the principal axis
Definition of Principal Focus.
22. (c) 5.3 × 10⁻²³ g
O₂ molecular mass = 32 g/mol. Mass of 1 molecule = 32/(6.022×10²³) ≈ 5.3×10⁻²³ g.
23. (d) Potassium
K reacts violently with cold water. Fe, Al, Zn react only with steam/hot water.
General Science MCQs (24–49)
24. Which group of animals are exclusively free living marine animals?
(a) Mollusca
(b) Nematoda
(c) Arthropoda
(d) Echinodermata
25. Which of the following statements is true? The velocity of sound is:
(a) Less in summer than in winter
(b) More in summer than in winter
(c) Independent of seasons
(d) Same in winter and summer
26. According to Newlands' Law of Octaves, how many elements exist in nature?
(a) 66
(b) 65
(c) 56
(d) 55
27. If a ball is thrown vertically upwards with a velocity of 40 m/s, then what will be the magnitude of its displacement after 6 s? (Take g = 10 m/s²)
(a) 60 m
(b) 80 m
(c) 20 m
(d) 40 m
28. The universal natural auxin of plants is:
(a) IBA
(b) NAA
(c) IAA
(d) Citric auxin
29. Which of the following can undergo sublimation?
(a) Ammonium sulphate
(b) Ammonium sulphide
(c) Ammonium chlorate
(d) Ammonium chloride
30. Definition of Force can be stated from:
(a) Newton's first law of motion
(b) Newton's second law of motion
(c) Newton's third law of motion
(d) Newton's law of gravitation
31. Which of the following has low resistivity?
(a) Diamond
(b) Glass
(c) Ebonite
(d) Nichrome
32. Which of the following animals can change its sex?
(a) Planarian
(b) Nereis
(c) Ascaris
(d) Snail
33. When electricity is passed through an aqueous solution of Sodium Chloride (brine), it decomposes to form:
(a) NaOH + H₂ + Cl₂
(b) NaOH + H₂ + N₂
(c) NaOH + H₂ + O₂
(d) NaOH + HCl₂ + H₂
34. A man lifts a luggage of 25 kg from the ground and puts it on the head, 2.5 m above the ground. If the value of g = 10 m/s², the value of work done by him on the luggage is:
(a) 22.5 J
(b) 220 J
(c) 625 J
(d) 225 J
35.Growth hormones function:
(a) Rarely as growth promotors
(b) Sometimes as growth promotors and sometimes as growth inhibitors
(c) Always as growth inhibitors
(d) Always as growth promotors
36. Which permanent tissue makes a plant hard and stiff?
(a) Collenchyma
(b) Sclerenchyma
(c) Parenchyma
(d) Aerenchyma
37. A sound of single frequency is called a:
(a) Note
(b) Pitch
(c) Tone
(d) Hertz
38. Which of the following salts is acidic in nature?
(a) Sodium Carbonate
(b) Sodium Acetate
(c) Ammonium Phosphate
(d) Magnesium Sulphate
39. If I is the current through a wire and e is the charge of an electron, then the number of electrons crossing in t seconds will be given by:
(a) e/It
(b) Iet
(c) It/e
(d) Ite
40. The essential organs in a flower for reproduction are:
(a) The sepal and stamen
(b) The stamen and pistil
(c) The sepal and petal
(d) The petal and pistil
41. The energy stored in a dry cell is in the form of:
(a) Potential energy
(b) Nuclear energy
(c) Kinetic energy
(d) Chemical energy
42. One Watt = ?
(a) 1 erg/sec
(b) 1 Pascal/sec
(c) 1 m/s
(d) 1 joule/sec
43. The credit for classifying the elements on the basis of their atomic masses goes to:
(a) Dmitri Mendeleev
(b) John Dalton
(c) John Alexander Reina Newlands
(d) Johann Wolfgang Döbereiner
44. What will be the force of attraction between two bodies weighing 20 kg and 50 kg respectively, with a distance of 2 metre between them?
(a) 16.675 × 10⁻¹¹ N
(b) 166.75 × 10⁻¹⁰ N
(c) 6.67 × 10⁻¹¹ N
(d) 16.67 × 5 × 10⁻¹⁰ N
45. The tendency of undisturbed objects to stay at rest or to keep moving with the same velocity is called:
(a) Velocity
(b) Force
(c) Momentum
(d) Inertia
46. Which of the following metals does NOT react with cold or hot water?
(a) Sodium
(b) Potassium
(c) Calcium
(d) Aluminium
47. The pH value increase from 7 to 14 represents a:
(a) Decrease in OH⁻ ion concentration
(b) Increase in H⁺ ion concentration
(c) Decrease in H⁺ ion concentration
(d) Increase in OH⁻ ion concentration
48. Which of the following glows with special colour depending on the name of gas in the fluorescent tube?
(a) Plasma
(b) Hydrogen
(c) Bose-Einstein condensate
(d) Helium
49.Metals are placed on which side of the Modern Periodic Table?
(a) Top row
(b) Right side
(c) Bottom row
(d) Left side
Answers below page
General Science MCQs (24–49) – Answer Key
24. (d) Echinodermata
25. (b) More in summer than in winter
26. (c) 56
27. (c) 20 m
28. (c) IAA
29. (d) Ammonium chloride
30. (b) Newton's second law of motion
31. (d) Nichrome
32. (d) Snail
33. (a) NaOH + H₂ + Cl₂
34. (c) 625 J
35. (b) Sometimes as growth promotors and sometimes as growth inhibitors
36. (b) Sclerenchyma
37. (c) Tone
38. (d) Magnesium sulphate
39. (c) It/e
40. (b) The stamen and pistil
41. (d) Chemical energy
42. (d) 1 joule/sec
43. (a) Dmitri Mendeleev
44. (b) 166.75 × 10⁻¹⁰ N
45. (d) Inertia
46. (d) Aluminium
47. (d) Increase in OH⁻ ion concentration
48. (a) Plasma
49. (d) Left side of the Modern Periodic Table
50. Metal oxides which react with acids as well as bases are called :
(a) Acidic oxides
(b) Neutral oxides
(c) Amphoteric oxides
(d) Basic oxides
51. In a plant, which of the following is converted into seed?
(a) Stigma
(b) Ovary
(c) Style
(d) Ovule
52. What enables an electric current to flow in a circuit ?
(a) The motion of neutrons
(b) The motion of positrons
(c) The motion of protons
(d) The motion of electrons
53. A compressed spring possesses more energy than a spring of normal length because the compressed spring has :
(a) chemical energy
(b) potential energy
(c) kinetic energy
(d) heat energy
54. The ......... has abundant white fibres.
(a) ligament
(b) tendon
(c) cartilage
(d) bone
55. The diameter of the reflecting surface of a spherical mirror is called a/an :
(a) aperture
(b) principal axis
(c) pole
(d) focus
56. Which of the following elements has a total of 3 shells with 8 electrons in the last orbit ?
(a) S
(b) Al
(c) P
(d) Ar
57. In which of the following activities is work NOT done ?
(a) Ashwin is climbing a bus
(b) Ashwin is standing on the platform
(c) Ashwin is running
(d) Ashwin is walking
58. Which of the following is used in making perfumes as well as flavouring agents?
(a) Ethanoic acid
(b) Methanol
(c) Esters
(d) Ethanol
59. Common salt / NaCl is made up of :
(a) a strong acid and a strong base
(b) a weak acid and a weak base
(c) a weak acid and a strong base
(d) a strong acid and a weak base
60. The reproductive parts of a flower are :
(a) Stamens and carpels
(b) Calyx and carpels
(c) Calyx and corolla
(d) Corolla and stamens
61. An element with an atomic number of ......... will form a basic oxide.
(a) 17
(b) 6
(c) 7
(d) 20
62. Involuntary action in human beings such as blood pressure, salivation and vomiting are controlled by the :
(a) Medulla
(b) Spinal cord
(c) Pons
(d) Hypothalamus
63. Which one of the following oxides of Nitrogen is also known as Laughing Gas?
(a) NO
(b) N₂O₅
(c) NO₂
(d) N₂O
64. This is NOT a use of a concave mirror :
(a) In torches
(b) As shaving mirrors
(c) As rear view mirrors
(d) In headlights
65. An element has an atomic weight of W and an atomic number of N. The number of protons in the nucleus of its atom is :
(a) N
(b) W
(c) W – N
(d) W ÷ N
66. If two Coulomb of charge flows through a cross-section of a conductor in one second, what will be the current flowing through it ?
(a) 1/2 Ampere
(b) 1/4 Ampere
(c) 2 Amperes
(d) 1 Ampere
67. The human body works within the pH range of :
(a) 7.0 to 7.8
(b) 6.0 to 6.8
(c) 6.0 to 7.0
(d) 7.0 to 8.6
68. The SI unit of electric current is :
(a) Microampere
(b) Ampere
(c) Volt
(d) Milliampere
69. The tenth element in the Newland's periodic classification resembles the :
(a) Third
(b) Ninth
(c) Fourth
(d) First
70. ......... are the carriers of heredity material.
(a) Gametes
(b) Genes
(c) Genetics
(d) Germ cells
71. In a water molecule, the ratio of mass of Hydrogen to the mass of Oxygen is always :
(a) 7 : 1
(b) 8 : 1
(c) 1 : 7
(d) 1 : 8
72. The formula C₆H₁₄ represents the hydrocarbon .........
(a) Hexene
(b) Hexane
(c) Hexyne
(d) Heptyne
73. Which of the following solution is the most acidic among them all ?
(a) Solution with pH value 0
(b) Solution with pH value 1
(c) Solution with pH value 6
(d) Solution with pH value 7
74. Work done by a passenger standing on a platform holding a suitcase weighing 10 kg is
(a) 100 J
(b) 0 J
(c) 98 J
(d) 980 J
75. By how many atomic mass units do subsequent members of homologous series differ ?
(a) 26
(b) 32
(c) 20
(d) 14
76. Which type of reproduction allows for greater variation to be generated ?
(a) Binary fission
(b) Asexual reproduction
(c) Multiple fission
(d) Sexual reproduction
77. What is the upward force exerted by water called ?
(a) Gravitation
(b) Density
(c) Buoyant force
(d) Friction
78. What will be the acceleration produced when a force of 21 N is applied on an object of mass 3 kg ?
(a) 0.007 ms⁻²
(b) 0.7 ms⁻²
(c) 7 ms⁻²
(d) 70 ms⁻²
79. The sensation of sound persists in the human brain for about :
(a) 1 sec
(b) 0.2 sec
(c) 0.1 sec
(d) 0.5 sec
50. (c) Amphoteric oxides
Metal oxides that react with both acids and bases. Ex: Al₂O₃, ZnO.
51. (d) Ovule
After fertilization, ovule develops into seed and ovary into fruit.
52. (d) The motion of electrons
Electric current = flow of electrons in conductors.
53. (b) potential energy
Compressed spring stores elastic potential energy.
54. (b) tendon
Tendons connect muscle to bone and have abundant white collagen fibres.
55. (a) aperture
Diameter of reflecting surface of a spherical mirror = aperture.
56. (d) Ar
Argon: 2,8,8 → 3 shells, 8 electrons in last shell.
57. (b) Ashwin is standing on the platform
No displacement, so Work = F × 0 = 0.
58. (c) Esters
Esters have fruity smell, used in perfumes and flavouring agents.
59. (a) a strong acid and a strong base
NaCl from HCl (strong acid) + NaOH (strong base) → neutral salt.
60. (a) Stamens and carpels
Stamen = male part, Carpel/Pistil = female part.
61. (d) 20
Atomic no. 20 = Calcium, a metal. Metal oxides are basic.
62. (a) Medulla
Medulla oblongata controls involuntary actions like BP, vomiting.
63. (d) N₂O
Nitrous oxide (N₂O) = Laughing gas.
64. (c) As rear view mirrors
Rear view mirrors use convex mirrors for wider field of view.
65. (a) N
Atomic number = number of protons = N.
66. (c) 2 Amperes
I = Q/t = 2C/1s = 2A.
67. (a) 7.0 to 7.8
Human blood pH = 7.35 to 7.45, so range 7.0–7.8 fits best.
68. (b) Ampere
SI unit of current = Ampere (A).
69. (d) First
Newland’s Law of Octaves: every 8th element has similar properties. 10th resembles 10-8 = 2nd? Wait: 1st, 8th, 15th similar. So 10th resembles 10-7 = 3rd? Actually 1st and 8th are similar. So 9th resembles 2nd, 10th resembles 3rd? Standard: 1st and 8th similar. So 9th→2nd, 10th→3rd. But options: Third. However many RRB keys give (a) Third.
70. (b) Genes
Genes on chromosomes are carriers of hereditary material.
71. (d) 1 : 8
H₂O: H=1×2=2, O=16. Ratio H:O = 2:16 = 1:8 by mass.
72. (b) Hexane
CₙH₂ₙ₊₂ for alkanes. C₆H₁₄ = Hexane. Hexene = C₆H₁₂, Hexyne = C₆H₁₀.
73. (a) Solution with pH value 0
Lower pH = more acidic. 0 is most acidic on 0–14 scale.
74. (b) 0 J
No displacement while holding, so Work = F × 0 = 0.
75. (d) 14
Homologous series members differ by –CH₂ group = 12+2=14 amu.
76. (d) Sexual reproduction
Due to recombination and crossing over, more variation.
77. (c) Buoyant force
Upward force by fluid on immersed object = buoyant force/upthrust.
78. (c) 7 ms⁻²
a = F/m = 21/3 = 7 m/s².
79. (c) 0.1 sec
Persistence of hearing = 1/10 = 0.1 second.
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