SSC CGL Science – Mock Test 2 – Tier I Style

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SSC CGL Science – Mock Test 2 – Tier I Style – 25 questions, subject: General Science. Every question has the correct answer with a one-line explanation; tap "Show Answer". Free practice for TNPSC, UPSC, SSC, Bank and RRB exams – Shanmugam IAS Academy, Coimbatore.

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1.  
A mechanic checks how many revolutions per minute an engine shaft makes. The instrument he uses is a:

Correct Answer: B [tachometer]

Explanation:

Tachometer – rpm; odometer – distance; altimeter – height.

2.  
NumericalA stone dropped from rest falls 5 m in its first second. Ignoring air, how far does it fall during the 4th second?

Correct Answer: D [35 m]

Explanation:

Successive seconds fall in ratio 1:3:5:7 → 5 × 7 = 35 m.

3.  
A nutcracker is a lever of which class?

Correct Answer: A [Second class – load between fulcrum and effort]

Explanation:

Class 2: load in the middle – nutcracker, wheelbarrow.

4.  
NumericalIn a hydraulic lift a force of 50 N acts on a piston of area 10 cm². What force is exerted on a piston of area 500 cm²?

Correct Answer: B [2500 N]

Explanation:

F₂ = F₁ × A₂/A₁ = 50 × 50 = 2500 N.

5.  
NumericalA patient's body is at 310 K. What would a Fahrenheit thermometer show?

Correct Answer: C [98.33 °F]

Explanation:

310 − 273.15 = 36.85 °C; × 9/5 + 32 = 98.33 °F.

6.  
NumericalIf sound travels at 350 m/s, the least distance from a wall for a distinct echo is:

Correct Answer: A [17.5 m]

Explanation:

Echo needs ≥ 0.1 s → 2d = 350 × 0.1 → d = 17.5 m.

7.  
NumericalLight travels at 2.25 × 10⁸ m/s in water. For light going from water to air, the sine of the critical angle is:

Correct Answer: B [3/4]

Explanation:

n = c/v = 3/2.25 = 4/3; sin C = 1/n = 3/4.

8.  
NumericalA 4 Ω resistor is joined in series with a parallel pair of 12 Ω and 6 Ω. The total resistance is:

Correct Answer: D [8 Ω]

Explanation:

12 ∥ 6 = 72/18 = 4 Ω; 4 + 4 = 8 Ω.

9.  
Which logic gates are called universal gates because any other gate can be built from them alone?

Correct Answer: C [NAND and NOR]

Explanation:

NAND and NOR are universal gates.

10.  
Heavy water (D₂O), used as a moderator, is denser than ordinary water by roughly:

Correct Answer: A [11%]

Explanation:

Answer: 11%. D₂O is about 11% denser.

11.  
When Mendeleev published his periodic table in 1869, the number of elements known was:

Correct Answer: B [63]

Explanation:

1869 table – 63 known elements, with gaps.

12.  
In the electrolysis of water, hydrogen and oxygen are collected in the volume ratio:

Correct Answer: D [2 : 1]

Explanation:

H₂ : O₂ = 2 : 1 by volume (1 : 8 is the mass ratio of H to O).

13.  
NumericalHow many grams of pure gold are there in a 12 g ornament of 18-carat gold?

Correct Answer: C [9 g]

Explanation:

Pure gold is 24 carat → 12 × 18/24 = 9 g.

14.  
The monomer from which Teflon is made is:

Correct Answer: B [tetrafluoroethene]

Explanation:

Teflon – tetrafluoroethene; PVC – vinyl chloride; polystyrene – styrene; polythene – ethene.

15.  
NumericalUrea, CO(NH₂)₂, has a molar mass of 60 g and contains 28 g of nitrogen per mole. Its nitrogen content is about:

Correct Answer: A [46.67%]

Explanation:

28/60 × 100 ≈ 46.67% – the highest among common solid fertilisers.

16.  
The ribosomes found in the cytoplasm of a bacterium are of the type:

Correct Answer: C [70S]

Explanation:

Prokaryotes 70S (50S + 30S); eukaryotic cytoplasm 80S.

17.  
Which of these animals is NOT a true fish?

Correct Answer: D [Crayfish]

Explanation:

Crayfish is a crustacean (arthropod); sea horse, flying fish and dogfish are fishes.

18.  
Which blood vessel carries deoxygenated blood away from the heart?

Correct Answer: B [Pulmonary artery]

Explanation:

Pulmonary artery – deoxygenated blood to the lungs; pulmonary veins bring oxygenated blood back.

19.  
How many cervical (neck) vertebrae does a giraffe have?

Correct Answer: C [7]

Explanation:

Almost all mammals, giraffe and human alike, have 7 cervical vertebrae.

20.  
Kala-azar is spread by the bite of the:

Correct Answer: D [sandfly]

Explanation:

Kala-azar – Leishmania – sandfly; tsetse fly spreads sleeping sickness.

21.  
Down's syndrome is caused by:

Correct Answer: A [an extra copy of chromosome 21]

Explanation:

Down's – trisomy 21; Turner's – XO; Klinefelter's – XXY; haemophilia – X-linked.

22.  
Chronological orderArrange these inventions in chronological order:
1. Transistor
2. Bell's telephone
3. Powered flight of the Wright brothers
4. Edison's practical incandescent bulb

Correct Answer: C [2, 4, 3, 1]

Explanation:

Telephone 1876 → bulb 1879 → powered flight 1903 → transistor 1947.

23.  
NumericalRadiocarbon dating: a bone retains only 1/32 of the C-14 of living bone. Taking the half-life as 5,730 years, the bone is about:

Correct Answer: A [28,650 years]

Explanation:

1/32 = (1/2)⁵ → five half-lives → 5 × 5,730 = 28,650 years.

24.  
The five-kingdom classification (Monera, Protista, Fungi, Plantae, Animalia) was proposed by:

Correct Answer: C [R. H. Whittaker in 1969]

Explanation:

Whittaker 1969; Linnaeus used two kingdoms.

25.  
By mass, the four most abundant elements of the Earth's crust in decreasing order are:

Correct Answer: D [O, Si, Al, Fe]

Explanation:

Oxygen, silicon, aluminium (the most abundant metal), iron.

➤ Full notes, shortcuts and every answer explained – SSC CGL 2026 General Science book (₹149): www.shanmugamiasacademy.in/study-materials/ssc-cgl-general-science

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