SSC CGL Science – Mock Test 3 – Tier II Style

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SSC CGL Science – Mock Test 3 – Tier II 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.  
Statement-basedConsider the statements:
I. One parsec is longer than one light-year.
II. One astronomical unit is longer than one light-year.
III. A light-year is a unit of distance, not of time.
Which are correct?

Correct Answer: B [I and III only]

Explanation:

1 pc ≈ 3.26 ly; 1 AU ≈ 1.5 × 10¹¹ m ≪ 1 ly ≈ 9.46 × 10¹⁵ m.

2.  
NumericalA ball is thrown at 20 m/s at the angle that gives the greatest range (g = 10 m/s²). The range is:

Correct Answer: B [40 m]

Explanation:

Max range at 45°: R = u²/g = 400/10 = 40 m.

3.  
NumericalA body just above Earth's surface is given √2 times the speed needed for a low circular orbit (about 7.9 km/s). It will:

Correct Answer: C [escape from Earth's gravity]

Explanation:

7.9 × √2 ≈ 11.2 km/s = escape velocity.

4.  
NumericalA barometer is filled with a liquid of relative density 3.4 instead of mercury (13.6). At sea level (76 cm of mercury) the column would be about:

Correct Answer: B [3.04 m]

Explanation:

Height × density is the same: 0.76 × 13.6/3.4 = 0.76 × 4 = 3.04 m.

5.  
NumericalA heat engine takes in heat at 327 °C and gives out waste heat at 27 °C. The highest efficiency it could ever reach is:

Correct Answer: A [50%]

Explanation:

Carnot limit 1 − 300 K/600 K = 0.5; using °C (1 − 27/327 ≈ 92%) is the trap.

6.  
NumericalA tuning fork of 425 Hz sends sound through air at 340 m/s. The wavelength is:

Correct Answer: D [0.8 m]

Explanation:

Answer: 0.8 m. λ = v/f = 340/425 = 0.8 m.

7.  
Assertion–ReasonAssertion (A): Red light is used for danger signals.
Reason (R): Red light is scattered the least by air and dust, so it is seen from far away.

Correct Answer: A [Both A and R are true and R explains A]

Explanation:

Longest visible wavelength → least scattering.

8.  
NumericalThe filament of a bulb rated 60 W, 240 V has a resistance (when glowing) of:

Correct Answer: A [960 Ω]

Explanation:

Answer: 960 Ω. R = V²/P = 57,600/60 = 960 Ω.

9.  
NumericalIn a hydrogen atom (Eₙ = −13.6/n² eV) the electron jumps from n = 4 to n = 2. The photon emitted carries about:

Correct Answer: D [2.55 eV]

Explanation:

13.6 (1/4 − 1/16) = 13.6 × 3/16 = 2.55 eV (blue-green Balmer line).

10.  
NumericalThe number of molecules in 4.4 g of carbon dioxide (molar mass 44 g) is about:

Correct Answer: C [6.022 × 10²²]

Explanation:

4.4/44 = 0.1 mol → 0.1 × 6.022 × 10²³ = 6.022 × 10²².

11.  
Match the followingMatch each halogen with its state and colour at room temperature:
P. Fluorine Q. Chlorine R. Bromine S. Iodine
1. Red-brown liquid 2. Violet-black solid 3. Pale yellow gas 4. Greenish-yellow gas

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

Explanation:

F₂ pale yellow gas; Cl₂ greenish-yellow gas; Br₂ red-brown liquid; I₂ violet-black solid.

12.  
NumericalSolution X has pH 3 and solution Y has pH 5. Compared with Y, the hydrogen-ion concentration of X is:

Correct Answer: B [100 times greater]

Explanation:

Each pH unit is a tenfold change: 10² = 100, and lower pH means more H⁺.

13.  
NumericalAluminium is deposited from Al³⁺ ions. Using 1 faraday ≈ 96,500 C, the charge needed to deposit one mole of aluminium is about:

Correct Answer: C [2,89,500 C]

Explanation:

Al³⁺ needs 3 mol electrons → 3 × 96,500 = 2,89,500 C.

14.  
Arrange in orderArrange the forms of coal in the order in which they form as burial deepens:
1. Bituminous coal
2. Peat
3. Anthracite
4. Lignite

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

Explanation:

Peat → lignite → bituminous → anthracite (carbon content rises).

15.  
True/false countHow many of these statements are correct?
I. Sodium soaps are hard and potassium soaps are soft.
II. Soap forms scum with hard water.
III. Detergents with branched chains are easily biodegradable.
IV. Potassium soaps are used in shaving creams.

Correct Answer: C [3]

Explanation:

III is wrong – branched-chain detergents are non-biodegradable; I, II, IV are correct.

16.  
Statement-basedConsider the statements about cell division:
I. Meiosis gives four haploid cells.
II. Mitosis halves the chromosome number.
III. Crossing over takes place in prophase I of meiosis.
Which are correct?

Correct Answer: C [I and III only]

Explanation:

Mitosis keeps the number unchanged; meiosis halves it.

17.  
Match the followingMatch the phylum with an example:
P. Porifera Q. Coelenterata R. Annelida S. Echinodermata
1. Asterias 2. Spongilla 3. Pheretima 4. Hydra

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

Explanation:

Spongilla – sponge; Hydra – coelenterate; Pheretima (earthworm) – annelid; Asterias (starfish) – echinoderm.

18.  
NumericalA heart beats 75 times a minute and pumps 72 mL per beat. The volume pumped per minute is:

Correct Answer: D [5.4 L]

Explanation:

75 × 72 = 5,400 mL = 5.4 L (cardiac output).

19.  
NumericalEach human hand has 27 bones and each foot has 26. Together, both hands and both feet have:

Correct Answer: A [106]

Explanation:

2 × 27 + 2 × 26 = 54 + 52 = 106 – over half of the 206 bones.

20.  
NumericalA snack has 20 g carbohydrate, 10 g protein and 5 g fat. Its energy value is about:

Correct Answer: B [165 kcal]

Explanation:

20 × 4 + 10 × 4 + 5 × 9 = 80 + 40 + 45 = 165 kcal.

21.  
NumericalA father of blood group A (genotype Iᴬi) and a mother of group B (Iᴮi) can have children of how many different blood groups?

Correct Answer: D [4]

Explanation:

Iᴬ/i × Iᴮ/i → IᴬIᴮ (AB), Iᴬi (A), Iᴮi (B), ii (O): all four.

22.  
Assertion–ReasonAssertion (A): Communication satellites are usually placed in geostationary orbit.
Reason (R): A geostationary satellite has a period of one day and seems fixed over one place on the equator.

Correct Answer: A [Both A and R are true and R explains A]

Explanation:

Fixed position → ground dishes need not track it.

23.  
NumericalIf the radius of a planet's orbit were made 16 times larger, its period of revolution would become:

Correct Answer: B [64 times]

Explanation:

T² ∝ r³ → T ∝ r^(3/2) = 16^(3/2) = 64.

24.  
NumericalA person's kidneys form 150 L of filtrate in a day and 98.8% of it is reabsorbed. The urine passed is about:

Correct Answer: A [1.8 L]

Explanation:

Answer: 1.8 L. 1.2% of 150 L = 1.8 L.

25.  
Chronological orderArrange in chronological order:
1. Virchow – all cells arise from pre-existing cells
2. Hooke – cells in cork
3. Brown – the nucleus
4. Schleiden – plants are made of cells

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

Explanation:

Hooke 1665 → Brown 1831 → Schleiden 1838 → Virchow 1855.

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