← Class 10 Board Exam (SSLC)
Tamil Nadu State Board · Science

TAMIL NADU STATE BOARD CLASS 10 SCIENCE 2025

2025 · 20 questions · First 10 Solutions Free
Questions 1–10 have full step-by-step solutions visible. Sign in to unlock all 20 →
Login to Download PDF
1 2 3 4 5 6 7 8 9 10 11🔒 12🔒 13🔒 14🔒 15🔒 16🔒 17🔒 18🔒 19🔒 20🔒
Q1 mcq
One kilogram force equals to:
a.
9.8 dyne
b.
9.8 \times 10^4 N
c.
98 \times 10^4 dyne Correct Answer
d.
980 dyne
Step-by-Step AI Explanation
Verified Method
1 kilogram-force (kgf) is the force exerted by gravity on a mass of 1 kg. Since $1\,\text{kgf} = 9.8\,\text{N}$ and $1\,\text{N} = 10^5\,\text{dyne}$, we get $1\,\text{kgf} = 9.8 \times 10^5\,\text{dyne} = 98 \times 10^4\,\text{dyne}$. Hence, option (c) is correct. The other options do not match the standard conversion.
Q2 mcq
The eye defect ‘Presbyopia’ can be corrected by:
a.
convex lens
b.
concave lens
c.
convex mirror
d.
bifocal lens Correct Answer
Step-by-Step AI Explanation
Verified Method
Presbyopia is an age-related defect of vision in which the power of accommodation of the eye decreases. It is usually corrected by using a bifocal lens, which has both convex and concave portions to help in near and distant vision. Hence, option (d) is correct. Convex and concave single lenses are used for specific defects like hypermetropia and myopia, respectively, while a convex mirror is not used for correcting eye defects.
Q3 mcq
The work done in moving a charge of 10 C across two points in a circuit is 100 J. What is the potential difference between the points?
a.
0.1 V
b.
10 V Correct Answer
c.
100 V
d.
1000 V
Step-by-Step AI Explanation
Verified Method
Potential difference is given by $V = \frac{W}{Q}$. Here, work done $W = 100\,\text{J}$ and charge $Q = 10\,\text{C}$. So, $V = \frac{100}{10} = 10\,\text{V}$. Therefore, option (b) is correct.
Q4 mcq
Artificial radioactivity was discovered by:
a.
Becquerel
b.
Irene Curie Correct Answer
c.
Roentgen
d.
Neils Bohr
Step-by-Step AI Explanation
Verified Method
Artificial radioactivity was discovered by Irene Curie and Frédéric Joliot. Among the given options, Irene Curie is correct. Becquerel discovered natural radioactivity, Roentgen discovered X-rays, and Neils Bohr is known for the atomic model.
Q5 mcq
___________ is an important metal to form amalgam.
a.
Ag
b.
Hg Correct Answer
c.
Mg
d.
Al
Step-by-Step AI Explanation
Verified Method
Mercury ($\text{Hg}$) is an important metal used to form amalgams, which are alloys of mercury with other metals. Hence, option (b) is correct. Silver, magnesium, and aluminium are not the metal used to form amalgam in this context.
Q6 mcq
When the pressure is increased at constant temperature, the solubility of gases in liquid __________.
a.
no change
b.
increases Correct Answer
c.
decreases
d.
no reaction
Step-by-Step AI Explanation
Verified Method
When pressure is increased at constant temperature, the solubility of gases in liquids increases. This is explained by Henry’s law. Therefore, option (b) is correct.
Q7 mcq
The pH of a solution is 3. Its $[OH^-]$ concentration is:
a.
1 \times 10^{-3} M
b.
3 M
c.
1 \times 10^{-11} M Correct Answer
d.
11 M
Step-by-Step AI Explanation
Verified Method
If the pH of a solution is 3, then $[H^+] = 10^{-3}\,\text{M}$. Using $\text{pH} + \text{pOH} = 14$, we get $\text{pOH} = 14 - 3 = 11$. Therefore, $[OH^-] = 10^{-11}\,\text{M}$. So, option (c) is correct.
Q8 mcq
$C_2H_5OH + 3O_2 \rightarrow 2CO_2 + 3H_2O$ is:
a.
Reduction of ethanol
b.
Combustion of ethanol Correct Answer
c.
Oxidation of ethanoic acid
d.
Oxidation of ethanal
Step-by-Step AI Explanation
Verified Method
The equation $C_2H_5OH + 3O_2 \rightarrow 2CO_2 + 3H_2O$ shows ethanol reacting with oxygen to form carbon dioxide and water. This is a combustion reaction of ethanol. Hence, option (b) is correct. It is not reduction or oxidation of ethanoic acid/ethanal because ethanol itself is the substance undergoing combustion.
Q9 mcq
Casparian strips are present in the __________ of the root.
a.
cortex
b.
pith
c.
pericycle
d.
endodermis Correct Answer
Step-by-Step AI Explanation
Verified Method
Casparian strips are present in the endodermis of the root, so option (d) is correct. The cortex, pith, and pericycle do not contain Casparian strips.
Q10 mcq
The centromere is found at the centre of the ___________ chromosome.
a.
Telocentric
b.
Metacentric Correct Answer
c.
Sub-metacentric
d.
Acrocentric
Step-by-Step AI Explanation
Verified Method
In a metacentric chromosome, the centromere lies at the centre. So option (b) is correct. In telocentric, acrocentric, and sub-metacentric chromosomes, the centromere is not at the centre.
🎉 10 Free Sample Solutions Completed

Unlock All 20 Questions & Solutions

Sign up free in seconds to unlock step-by-step AI answers for the remaining 10 questions.

Continue with Google (Free) Create Free Account
Q11 mcq
World AIDS Day:
a.
December 1
b.
May 31
c.
April 22
d.
October 2
Correct Answer & Step-by-Step Solution Locked

Sign in free to reveal the correct answer and AI explanation for this question.

Sign in with Google Log in / Sign up Free
Q12 mcq
Which software is used to create animation?
a.
Paint
b.
PDF
c.
MS Word
d.
Scratch
Correct Answer & Step-by-Step Solution Locked

Sign in free to reveal the correct answer and AI explanation for this question.

Sign in with Google Log in / Sign up Free
Q13 short answer
Define one Calorie.
Correct Answer & Step-by-Step Solution Locked

Sign in free to reveal the correct answer and AI explanation for this question.

Sign in with Google Log in / Sign up Free
Q14 short answer
What is a longitudinal wave?
Correct Answer & Step-by-Step Solution Locked

Sign in free to reveal the correct answer and AI explanation for this question.

Sign in with Google Log in / Sign up Free
Q15 short answer
State two conditions necessary for rusting of iron.
Correct Answer & Step-by-Step Solution Locked

Sign in free to reveal the correct answer and AI explanation for this question.

Sign in with Google Log in / Sign up Free
Q16 short answer
Match the following: 1. Functional group -OH 2. Heterocyclic compounds 3. Unsaturated compounds 4. Soap 5. Carbocyclic compounds
Correct Answer & Step-by-Step Solution Locked

Sign in free to reveal the correct answer and AI explanation for this question.

Sign in with Google Log in / Sign up Free
Q17 short answer
What is the importance of valves in the heart?
Correct Answer & Step-by-Step Solution Locked

Sign in free to reveal the correct answer and AI explanation for this question.

Sign in with Google Log in / Sign up Free
Q18 short answer
What is Bolting? How can it be induced artificially?
Correct Answer & Step-by-Step Solution Locked

Sign in free to reveal the correct answer and AI explanation for this question.

Sign in with Google Log in / Sign up Free
Q19 short answer
Identify the parts A, B, C and D in the given figure.
Correct Answer & Step-by-Step Solution Locked

Sign in free to reveal the correct answer and AI explanation for this question.

Sign in with Google Log in / Sign up Free
Q20 short answer
The degenerated wing ____________ is a peculiar trait. Why is it called a peculiar trait?
Correct Answer & Step-by-Step Solution Locked

Sign in free to reveal the correct answer and AI explanation for this question.

Sign in with Google Log in / Sign up Free