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Sections:
Physics
Chemistry
Biology
Q1. Physics
If the speed of light is 3 × 10⁸ m/s, the distance traveled by light in one year (light year) is approximately:
A. 9.46 × 10¹² km
B. 9.46 × 10¹² km
C. 9.46 × 10¹⁵ km
D. 3 × 10⁸ km
Correct Answer: B
1 light year = 9.46 × 10¹² km.
Q2. Physics
A force of 10 N acts on a body of mass 2 kg for 5 s. The impulse is:
A. 10 Ns
B. 50 Ns
C. 2 Ns
D. 25 Ns
Correct Answer: B
Impulse = F × t = 10 × 5 = 50 Ns.
Q3. Physics
The internal resistance of an ideal voltmeter is:
A. Zero
B. Low
C. Infinity
D. 1 Ω
Correct Answer: C
Ideal voltmeter has infinite resistance to draw zero current.
Q4. Physics
The phenomenon of splitting of light into its constituent colors is called:
A. Reflection
B. Refraction
C. Dispersion
D. Diffraction
Correct Answer: C
Dispersion splits white light into VIBGYOR colors (e.g., rainbow).
Q5. Physics
Which law states that entropy of an isolated system always increases?
A. First law
B. Second law
C. Third law
D. Zeroth law
Correct Answer: B
Second law: entropy of isolated system always increases (ΔS ≥ 0).
Q6. Physics
The time period of a simple pendulum depends on:
A. Mass of bob
B. Amplitude (small)
C. Length of pendulum
D. Material of bob
Correct Answer: C
T = 2π√(L/g). Time period depends only on length and g.
Q7. Physics
The magnetic field at the center of a current carrying circular loop is:
A. Zero
B. μ₀I/2R
C. μ₀I/R
D. μ₀I/4πR
Correct Answer: B
B = μ₀I/(2R) at center of circular loop.
Q8. Physics
The threshold frequency for a metal is 5 × 10¹⁴ Hz. Its work function is (h = 6.63 × 10⁻³⁴ Js):
A. 3.315 × 10⁻¹⁹ J
B. 3.315 × 10⁻¹⁹ J
C. 6.63 × 10⁻¹⁹ J
D. 1.99 × 10⁻¹⁹ J
Correct Answer: B
φ = hf₀ = 6.63×10⁻³⁴ × 5×10¹⁴ = 3.315×10⁻¹⁹ J.
Q9. Physics
The direction of induced current is given by:
A. Ampere's law
B. Biot-Savart law
C. Lenz's law
D. Ohm's law
Correct Answer: C
Lenz's law determines direction: induced current opposes change in flux.
Q10. Physics
Radioactive decay follows which order of kinetics?
A. Zero order
B. First order
C. Second order
D. Third order
Correct Answer: B
Radioactive decay follows first order kinetics: N = N₀e⁻λᵗ.
Q11. Chemistry
Which quantum number determines the shape of orbital?
Correct Answer: B
Azimuthal quantum number (l) determines orbital shape (s→0, p→1, d→2).
Q12. Chemistry
The most stable allotrope of carbon is:
A. Diamond
B. Graphite
C. Fullerene
D. Coal
Correct Answer: B
Graphite is the most stable allotrope of carbon at room temperature.
Q13. Chemistry
Which of these is an example of an aromatic compound?
A. Cyclohexane
B. Benzene
C. Cyclohexene
D. 1,3-cyclohexadiene
Correct Answer: B
Benzene (C₆H₆) is aromatic with delocalized 6π electrons.
Q14. Chemistry
The process of electrolysis is based on:
A. Chemical effect of current
B. Magnetic effect of current
C. Redox reactions
D. Heating effect
Correct Answer: C
Electrolysis involves redox reactions at electrodes driven by electric current.
Q15. Chemistry
Which of the following is a saturated hydrocarbon?
A. C₂H₄
B. C₃H₈
C. C₂H₂
D. C₆H₆
Correct Answer: B
Propane (C₃H₈) follows CₙH₂ₙ₊₂ → saturated alkane.
Q16. Chemistry
The oxide that turns red litmus blue is:
A. CO₂
B. SO₂
C. Na₂O
D. P₂O₅
Correct Answer: C
Na₂O is basic oxide → turns red litmus blue. CO₂, SO₂, P₂O₅ are acidic.
Q17. Chemistry
The number of atoms in 1 mole of any substance is:
A. 6.022 × 10²³
B. Avogadro's number
C. 6.022 × 10²⁰
D. Both A and B
Correct Answer: D
1 mole = 6.022 × 10²³ particles = Avogadro's number.
Q18. Chemistry
Which of these is a greenhouse gas?
Correct Answer: C
Methane (CH₄) is a potent greenhouse gas (~25× more effective than CO₂).
Q19. Chemistry
Which of the following has covalent bonding?
A. NaCl
B. H₂O
C. KBr
D. CaO
Correct Answer: B
H₂O has covalent bonds (sharing of electrons). NaCl, KBr, CaO are ionic.
Q20. Chemistry
pH scale ranges from:
A. 0 to 7
B. 7 to 14
C. 0 to 14
D. 1 to 10
Correct Answer: C
pH scale ranges 0-14 (0-6 acidic, 7 neutral, 8-14 basic).
Q21. Biology
Which organelle is involved in protein synthesis?
A. Mitochondria
B. Ribosome
C. Lysosome
D. Golgi body
Correct Answer: B
Ribosomes (composed of rRNA + proteins) synthesize proteins.
Q22. Biology
Which disease is caused by a virus?
A. Cholera
B. Typhoid
C. AIDS
D. Malaria
Correct Answer: C
AIDS is caused by HIV (virus). Cholera/typhoid: bacteria, Malaria: protozoa.
Q23. Biology
The process of cell division for growth is:
A. Meiosis
B. Mitosis
C. Binary fission
D. Budding
Correct Answer: B
Mitosis produces identical daughter cells for growth and repair.
Q24. Biology
The enzyme that breaks down proteins in stomach is:
A. Amylase
B. Pepsin
C. Lipase
D. Trypsin
Correct Answer: B
Pepsin (in gastric juice) breaks proteins into peptides in acidic medium.
Q25. Biology
Which part of the flower becomes fruit?
A. Petal
B. Sepal
C. Ovary
D. Stamen
Correct Answer: C
After fertilization, the ovary develops into the fruit.
Q26. Biology
The main function of RBC is:
A. Blood clotting
B. Oxygen transport
C. Immunity
D. Antibody production
Correct Answer: B
RBCs (erythrocytes) contain hemoglobin to transport O₂ and CO₂.
Q27. Biology
Which hormone is called the "fight or flight" hormone?
A. Insulin
B. Adrenaline
C. Thyroxine
D. Estrogen
Correct Answer: B
Adrenaline (epinephrine) prepares body for stress (increases HR, BP, etc.).
Q28. Biology
The smallest bone in the human body is:
A. Femur
B. Stapes
C. Patella
D. Phalanges
Correct Answer: B
Stapes (stirrup bone in middle ear) is the smallest bone (~3 mm).
Q29. Biology
Which of these is a vestigial organ in humans?
A. Liver
B. Heart
C. Appendix
D. Kidney
Correct Answer: C
Appendix is a vestigial organ (remnant of larger cecum in herbivore ancestors).
Q30. Biology
The green pigment in plants that traps sunlight is:
A. Xanthophyll
B. Chlorophyll
C. Carotene
D. Phycobilin
Correct Answer: B
Chlorophyll absorbs sunlight (mainly blue and red) for photosynthesis.