Why does sexual reproduction result in greater variation among offspring?
a.
It produces exact replicas of the parent.
b.
It occurs only in humans.
c.
It allows combination of genetic material from two individuals.
Correct Answer
d.
It involves copying of identical DNA.
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Q2mcq
Which of the following explains the absence of recessive traits in the F ₁ generation and their reappearance in the F ₂ generation in Mendal’s experiment?
a.
Recessive alleles are hidden in F ₁ but reappear in F ₂ due to segregation.
Correct Answer
b.
Recessive traits skip generations randomly
c.
Recessive traits become dominant in F ₂ generation.
d.
Recessive traits are completely destroyed in the F ₁ generation
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Q3mcq
The blades of a windmill rotate because of which of the following?
a.
Elastic energy
b.
Wind’s kinetic energy
Correct Answer
c.
Sound energy
d.
Light energy
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Q4mcq
Which of the following statements is FALSE regarding cells?
a.
Cells can be round, oval, spindle-shaped or branched.
b.
Nerve cells are long to help in the conduction of impulses.
c.
All cells are of the same size and shape.
Correct Answer
d.
Cell shape is often related to its function.
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Q5mcq
In the chlor-alkali process, what is given off at the anode?
a.
Chlorine gas
Correct Answer
b.
Nitrogen gas
c.
Sodium Hydroxide
d.
Hydrogen gas Test Date 16/12/2025 Test Time 12:45 PM - 2:15 PM Subject RRB Level 01 Stage I * Note Correct Answer will carry 1 mark per Question. Incorrect Answer will carry 1/3 Negative mark per Question. 1. Options shown in green color with a tick icon are correct. 2. Chosen option on the right of the question indicates the option selected by the candidate.
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Q6mcq
Calcium hydroxide reacts slowly with the carbon dioxide in air to form a thin layer of which of the following substances that could be used for the purpose of whitewashing?
a.
CaO
b.
CaCO3
Correct Answer
c.
Ca(HCO ₃ ) ₂
d.
CaSO4
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Q7mcq
Select the correct statement with respect to 'particles of matter'.
a.
Particles of matter are stationary.
b.
In liquid, particles have no space between them.
c.
Particles of matter move continuously.
Correct Answer
d.
In solids, particles have more space between them.
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Q8mcq
Tooth enamel made of calcium hydroxyapatite starts decaying when pH in mouth is lower than:
a.
5.5
Correct Answer
b.
8.5
c.
6.5
d.
7.5
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Q9mcq
What is the primary role of a 'functional group' in an organic compound?
a.
To increase the molecular mass of the compound
b.
To change the carbon chain from straight to branched
c.
To determine the physical state (solid, liquid, gas) of the compound
d.
To provide the characteristic chemical properties of the compound
Correct Answer
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Q10mcq
Which among the following covalent compounds will have the least number of shared electron pairs?
a.
CH4
b.
H2
Correct Answer
c.
O2
d.
N2
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A potential difference of 6 V is applied across the two ends of a conducting wire of resistance R Ω. What will be the value of R if the current flowing through the wire is 2 A?
a.
1/3
b.
1/12
c.
12
d.
3
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Rekha swims in a 40-metre-long pool. She swims from one end to the other and comes back, covering 80 metres in one minute along a straight path. What is her average velocity?
a.
20 m/min
b.
80 m/min
c.
40 m/min
d.
0 m/min
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In quadrilateral PQRS, the bisectors of ∠ R and ∠ S meet at the point T (inside the quadrilateral) and ∠ STR = 37.5°. If the ratio of ∠ P to ∠ Q is 7 : 8, then what is the difference between the measures of ∠ Q and ∠ P?
a.
6°
b.
3°
c.
5°
d.
2°
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