SSC CGL Science – Mock Test 1 – Tier I Style

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SSC CGL Science – Mock Test 1 – 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.  
NumericalA ship moving at 10 knots covers how many kilometres in 3 hours?

Correct Answer: C [55.56 km]

Explanation:

1 knot = 1.852 km/h → 10 × 1.852 × 3 = 55.56 km.

2.  
NumericalA train runs at a steady 90 km/h. How far does it go in 8 seconds?

Correct Answer: B [200 m]

Explanation:

90 × 5/18 = 25 m/s; 25 × 8 = 200 m.

3.  
NumericalA pump rated 2 hp runs for 3 hours. The electrical energy it uses is closest to:

Correct Answer: A [4.48 kWh]

Explanation:

1 hp ≈ 746 W → 2 × 746 × 3 = 4476 Wh ≈ 4.48 kWh.

4.  
Odd one outPick the odd one out by the principle it works on:

Correct Answer: D [Hydraulic brake of a car]

Explanation:

Hydraulic brake – Pascal's law; the other three – Bernoulli's principle.

5.  
NumericalHow much heat must be supplied to melt 50 g of ice that is already at 0 °C?

Correct Answer: D [4000 cal]

Explanation:

Latent heat of fusion 80 cal/g → 50 × 80 = 4000 cal (27000 cal would be for vaporising 50 g).

6.  
NumericalSea water carries sound at 1530 m/s. A ship's echo-sounder hears the echo from the sea bed 3 s after sending the pulse. How deep is the sea?

Correct Answer: A [2295 m]

Explanation:

depth = vt/2 = 1530 × 3 ÷ 2 = 2295 m.

7.  
Reverse questionTwo thin lenses in contact give a combined power of +1.5 D. One of them is a convex lens of +2.5 D. The other lens is:

Correct Answer: B [concave, focal length 100 cm]

Explanation:

Powers add: P₂ = 1.5 − 2.5 = −1 D → concave, f = 100/1 = 100 cm.

8.  
NumericalAn electric iron of 1.2 kW is used for 45 minutes every day for 20 days. At ₹ 6 per unit, the cost is:

Correct Answer: C [₹ 108]

Explanation:

1.2 kW × 0.75 h × 20 = 18 kWh; 18 × ₹ 6 = ₹ 108.

9.  
NumericalIodine-131 has a half-life of about 8 days. What fraction of a sample is left after 40 days?

Correct Answer: A [1/32]

Explanation:

Half-life ≈ 8 days → 5 half-lives → (1/2)⁵ = 1/32.

10.  
The chemical symbol of which element comes from the Latin word 'stannum'?

Correct Answer: D [Tin]

Explanation:

Sn – stannum (tin); Sb is antimony, Na natrium, Pb plumbum.

11.  
In 1962 Neil Bartlett prepared the first compound of a noble gas. That gas was:

Correct Answer: B [xenon]

Explanation:

Bartlett 1962 – a xenon compound; xenon fluorides XeF₂, XeF₄ followed.

12.  
Match the followingMatch the common name with the formula:
P. Baking soda Q. Washing soda R. Bleaching powder S. Plaster of Paris
1. CaSO₄·½H₂O 2. CaOCl₂ 3. NaHCO₃ 4. Na₂CO₃·10H₂O

Correct Answer: C [P-3, Q-4, R-2, S-1]

Explanation:

NaHCO₃ baking soda; Na₂CO₃·10H₂O washing soda; CaOCl₂ bleaching powder; CaSO₄·½H₂O plaster of Paris.

13.  
German silver, used for cheap cutlery and ornaments, contains:

Correct Answer: C [copper, zinc and nickel]

Explanation:

German silver has no silver: Cu + Zn + Ni.

14.  
Of butane, pentane, hexane and heptane, which one has exactly three structural isomers?

Correct Answer: B [Pentane]

Explanation:

Isomer counts: butane 2, pentane 3, hexane 5, heptane 9.

15.  
Arrange the artificial sweeteners from the least sweet to the sweetest (compared with cane sugar):

Correct Answer: C [aspartame < saccharin < sucralose < alitame]

Explanation:

Saccharin 550, aspartame 100, sucralose 600, alitame 2000 times sucrose.

16.  
The term 'protoplasm' for the living substance of the cell was coined in 1839 by:

Correct Answer: D [Purkinje]

Explanation:

Purkinje 1839; Brown found the nucleus (1831); Hooke named cells (1665).

17.  
'Oryza sativa' is the scientific name of:

Correct Answer: A [rice]

Explanation:

Oryza sativa rice; Zea mays maize; Pisum sativum pea; Allium cepa onion.

18.  
NumericalThe kidneys of an adult filter about 125 mL of blood plasma per minute. The filtrate formed in a day is about:

Correct Answer: B [180 L]

Explanation:

125 mL × 1440 min = 180 000 mL = 180 L; almost all is reabsorbed.

19.  
In the human rib cage, the ribs not joined to the sternum at all ('floating ribs') are the:

Correct Answer: A [11th and 12th pairs]

Explanation:

7 true, 3 false (8th–10th), 2 floating (11th–12th).

20.  
Most peptic (stomach) ulcers are caused by the bacterium:

Correct Answer: C [Helicobacter pylori]

Explanation:

H. pylori – peptic ulcer, treatable with antibiotics; Salmonella – typhoid; Vibrio – cholera; Streptococcus – pneumonia.

21.  
NumericalIn Mendel's dihybrid cross (F2 ratio 9:3:3:1), what fraction of the F2 plants show both recessive traits?

Correct Answer: D [1/16]

Explanation:

The '1' of 9:3:3:1 → 1/16 (= 1/4 × 1/4).

22.  
ISRO, set up in 1969, has its headquarters at:

Correct Answer: C [Bengaluru]

Explanation:

Headquarters Bengaluru; rockets are launched from Sriharikota.

23.  
At about what height above the equator does a geostationary satellite orbit?

Correct Answer: D [35,786 km]

Explanation:

Period one day → height ≈ 35,786 km; 1.5 million km is the Sun–Earth L1 distance.

24.  
Normal saline used in drips is isotonic with blood cells. Its sodium chloride content is:

Correct Answer: A [0.9%]

Explanation:

Answer: 0.9%. Normal saline = 0.9% NaCl.

25.  
Chronological orderArrange in chronological order:
1. Koch identifies the TB bacterium
2. Jenner's smallpox vaccination
3. Fleming discovers penicillin
4. Pasteur's rabies vaccine

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

Explanation:

Jenner 1796 → Koch 1882 → Pasteur 1885 → Fleming 1928.

➤ 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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