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Sections:
Physics
Chemistry
Biology
Q1. Physics
A body starts from rest and moves with uniform acceleration of 2 m/s². The distance covered in 5 seconds is:
A. 10 m
B. 25 m
C. 50 m
D. 5 m
Correct Answer: B
s = ut + ½at² = 0 + ½ × 2 × 25 = 25 m.
Q2. Physics
Which of the following has the highest specific heat capacity?
A. Iron
B. Copper
C. Water
D. Lead
Correct Answer: C
Water has the highest specific heat capacity (4200 J/kg°C) among common substances.
Q3. Physics
The SI unit of electric potential is:
A. Coulomb
B. Ohm
C. Volt
D. Ampere
Correct Answer: C
Electric potential is measured in Volts (V = J/C).
Q4. Physics
A convex mirror always forms which type of image?
A. Real and inverted
B. Virtual and erect
C. Real and erect
D. Virtual and inverted
Correct Answer: B
Convex mirrors always form virtual, erect, and diminished images regardless of object position.
Q5. Physics
The dimensional formula of force is:
A. [MLT⁻¹]
B. [ML⁻¹T⁻²]
C. [MLT⁻²]
D. [ML²T⁻²]
Correct Answer: C
F = ma → [F] = [M][LT⁻²] = [MLT⁻²].
Q6. Chemistry
The most electronegative element is:
A. Oxygen
B. Fluorine
C. Chlorine
D. Nitrogen
Correct Answer: B
Fluorine (4.0) is the most electronegative element on the Pauling scale.
Q7. Chemistry
Which gas is produced when zinc reacts with dilute H₂SO₄?
A. Oxygen
B. Chlorine
C. Hydrogen
D. Carbon dioxide
Correct Answer: C
Zn + H₂SO₄ → ZnSO₄ + H₂↑. Hydrogen gas is produced.
Q8. Chemistry
Which of the following is a noble gas?
A. Hydrogen
B. Nitrogen
C. Argon
D. Chlorine
Correct Answer: C
Argon (Ar) is a noble gas in Group 18 with a full valence shell.
Q9. Chemistry
The number of oxygen atoms in 1 mole of H₂SO₄ is:
A. 4 × 6.022 × 10²³
B. 6.022 × 10²³
C. 2 × 6.022 × 10²³
D. 7 × 6.022 × 10²³
Correct Answer: A
1 molecule of H₂SO₄ has 4 O atoms. 1 mole has 4 × NA = 4 × 6.022 × 10²³ atoms.
Q10. Chemistry
Which bond is present in NaCl?
A. Covalent bond
B. Metallic bond
C. Ionic bond
D. Hydrogen bond
Correct Answer: C
NaCl forms an ionic bond between Na⁺ and Cl⁻ through electron transfer.
Q11. Biology
The powerhouse of the cell is:
A. Nucleus
B. Ribosome
C. Mitochondria
D. Golgi apparatus
Correct Answer: C
Mitochondria produce ATP through cellular respiration, hence called the powerhouse of the cell.
Q12. Biology
Which vitamin is produced in the skin on exposure to sunlight?
A. Vitamin A
B. Vitamin D
C. Vitamin C
D. Vitamin B12
Correct Answer: B
UV rays convert 7-dehydrocholesterol to Vitamin D₃ in the skin.
Q13. Biology
The human heart has how many chambers?
Correct Answer: C
Human heart has 4 chambers: 2 atria and 2 ventricles.
Q14. Biology
DNA replication is which type of process?
A. Conservative
B. Semiconservative
C. Dispersive
D. Random
Correct Answer: B
DNA replication follows the semiconservative model as demonstrated by Meselson and Stahl.
Q15. Biology
Which hormone regulates blood sugar level?
A. Thyroxine
B. Insulin
C. Adrenaline
D. Estrogen
Correct Answer: B
Insulin lowers blood glucose, while glucagon raises it.
Q16. Physics
The work done in moving a charge of 5 C across two points with potential difference 10 V is:
A. 2 J
B. 15 J
C. 50 J
D. 5 J
Correct Answer: C
W = QV = 5 × 10 = 50 J.
Q17. Physics
The frequency of a wave with time period 0.02 s is:
A. 20 Hz
B. 50 Hz
C. 100 Hz
D. 25 Hz
Correct Answer: B
f = 1/T = 1/0.02 = 50 Hz.
Q18. Physics
The refractive index of a medium is 1.5. Speed of light in this medium is:
A. 3 × 10⁸ m/s
B. 2 × 10⁸ m/s
C. 4.5 × 10⁸ m/s
D. 1.5 × 10⁸ m/s
Correct Answer: B
v = c/n = 3×10⁸/1.5 = 2×10⁸ m/s.
Q19. Physics
Which of the following is a scalar quantity?
A. Force
B. Velocity
C. Energy
D. Acceleration
Correct Answer: C
Energy has magnitude only (no direction), hence scalar. Force, velocity, acceleration are vectors.
Q20. Physics
A body of mass 2 kg is moving with velocity 3 m/s. Its kinetic energy is:
A. 3 J
B. 9 J
C. 6 J
D. 18 J
Correct Answer: B
KE = ½mv² = ½ × 2 × 9 = 9 J.
Q21. Chemistry
The pH of a neutral solution at 25°C is:
Correct Answer: B
[H⁺] = [OH⁻] = 10⁻⁷ M → pH = 7 at 25°C.
Q22. Chemistry
The chemical formula of rust is:
A. FeO
B. Fe₂O₃
C. Fe₂O₃·xH₂O
D. Fe₃O₄
Correct Answer: C
Rust is hydrated iron(III) oxide, Fe₂O₃·xH₂O.
Q23. Chemistry
Which catalyst is used in the Haber process for ammonia synthesis?
A. Vanadium pentoxide
B. Iron
C. Nickel
D. Platinum
Correct Answer: B
Haber process uses finely divided iron with promoters (K₂O, Al₂O₃) as catalyst.
Q24. Chemistry
Which of the following is an isotope of hydrogen?
A. Protium
B. Deuterium
C. Tritium
D. All of these
Correct Answer: D
Protium (¹H), Deuterium (²H), and Tritium (³H) are all isotopes of hydrogen.
Q25. Chemistry
The number of electrons in Na⁺ ion is:
Correct Answer: B
Na (11 e⁻) → Na⁺ loses 1 e⁻ → 10 electrons.
Q26. Biology
The longest bone in the human body is:
A. Humerus
B. Femur
C. Tibia
D. Fibula
Correct Answer: B
Femur (thigh bone) is the longest and strongest bone in the human body.
Q27. Biology
Which organ is responsible for blood filtration?
A. Liver
B. Kidney
C. Heart
D. Lungs
Correct Answer: B
Kidneys filter blood through nephrons, removing waste and excess water to form urine.
Q28. Biology
The pigment responsible for skin color is:
A. Chlorophyll
B. Haemoglobin
C. Melanin
D. Carotene
Correct Answer: C
Melanin produced by melanocytes determines skin, hair, and eye color.
Q29. Biology
Blood group with no antigens on RBC is:
Correct Answer: D
Blood group O has no A or B antigens on RBCs but has both anti-A and anti-B antibodies.
Q30. Biology
Which enzyme breaks down starch in the mouth?
A. Amylase
B. Pepsin
C. Lipase
D. Trypsin
Correct Answer: A
Salivary amylase (ptyalin) breaks down starch into maltose in the oral cavity.