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Sections:
Physics
Chemistry
Biology
Q1. Physics
A particle moves in a circle of radius 2 m with speed 4 m/s. Its centripetal acceleration is:
A. 2 m/s²
B. 8 m/s²
C. 4 m/s²
D. 16 m/s²
Correct Answer: B
a_c = v²/r = 16/2 = 8 m/s².
Q2. Physics
The dimension of Planck's constant is same as:
A. Energy
B. Angular momentum
C. Force
D. Power
Correct Answer: B
h = E/ν → [ML²T⁻¹] same as angular momentum.
Q3. Physics
A wire of length L and area A has resistance R. If length is halved and area doubled, new resistance is:
Correct Answer: B
R' = ρ(L/2)/(2A) = (ρL/A)/4 = R/4.
Q4. Physics
The angle between electric dipole moment and electric field in stable equilibrium is:
Correct Answer: A
In stable equilibrium, p is parallel to E → θ = 0°, torque = 0.
Q5. Physics
The energy equivalent of 1 amu is:
A. 931 eV
B. 931 MeV
C. 931 keV
D. 931 J
Correct Answer: B
1 amu = 931.5 MeV/c².
Q6. Physics
A lens of power +2 D has focal length:
A. 0.5 m
B. 0.5 m
C. 2 m
D. 5 m
Correct Answer: B
f = 1/P = 1/2 = 0.5 m. Positive power → convex lens.
Q7. Physics
A body of mass 5 kg is moving with momentum 20 kg m/s. Its velocity is:
A. 2 m/s
B. 4 m/s
C. 100 m/s
D. 0.25 m/s
Correct Answer: B
v = p/m = 20/5 = 4 m/s.
Q8. Physics
In Young's double slit experiment, fringe width depends on:
A. Wavelength only
B. Slit width
C. Wavelength, slit distance, and screen distance
D. Screen distance only
Correct Answer: C
β = λD/d. Depends on λ, D (screen distance), and d (slit separation).
Q9. Physics
The coefficient of performance of a refrigerator is given by:
A. Q₁/W
B. Q₂/W
C. W/Q₁
D. (Q₁-Q₂)/W
Correct Answer: B
COP = Q₂/W where Q₂ is heat extracted from cold reservoir and W is work input.
Q10. Physics
The reason of mirage in desert is:
A. Reflection
B. Total internal reflection
C. Diffraction
D. Interference
Correct Answer: B
Mirage occurs due to total internal reflection of light in layers of different refractive indices.
Q11. Chemistry
The element with electronic configuration 1s²2s²2p⁶3s²3p⁶ belongs to:
A. Group 2
B. Group 18
C. Group 16
D. Group 17
Correct Answer: B
Full 3p⁶ → noble gas configuration → Group 18 (Argon).
Q12. Chemistry
Which of the following shows paramagnetism?
Correct Answer: C
O₂ has two unpaired electrons in its MO configuration → paramagnetic.
Q13. Chemistry
The IUPAC name of CH₃COOH is:
A. Formic acid
B. Ethanoic acid
C. Acetic acid
D. Methanoic acid
Correct Answer: B
CH₃COOH → 2 carbons → Ethanoic acid (common: acetic acid).
Q14. Chemistry
The shape of NH₃ molecule is:
A. Trigonal planar
B. Trigonal pyramidal
C. Tetrahedral
D. Linear
Correct Answer: B
NH₃: 3 bond pairs + 1 lone pair → trigonal pyramidal shape.
Q15. Chemistry
Which of the following is NOT a polymer?
A. Nylon
B. Cellulose
C. Glucose
D. PVC
Correct Answer: C
Glucose is a monomer (monosaccharide), not a polymer. Nylon, cellulose, PVC are polymers.
Q16. Chemistry
In a redox reaction, oxidation involves:
A. Loss of electrons
B. Gain of electrons
C. Gain of hydrogen
D. Loss of oxygen
Correct Answer: A
Oxidation = loss of electrons, Reduction = gain of electrons (OIL RIG).
Q17. Chemistry
The bond angle in water is approximately:
A. 90°
B. 109.5°
C. 104.5°
D. 120°
Correct Answer: C
Water has bent shape with 104.5° angle due to lone pair repulsion.
Q18. Chemistry
Which of these is a double displacement reaction?
A. 2H₂ + O₂ → 2H₂O
B. NaCl + AgNO₃ → AgCl + NaNO₃
C. Zn + H₂SO₄ → ZnSO₄ + H₂
D. CaCO₃ → CaO + CO₂
Correct Answer: B
Double displacement: two compounds exchange ions → new compounds.
Q19. Chemistry
The number of moles in 11 g of CO₂ is:
Correct Answer: B
Molar mass CO₂ = 44 g/mol. n = 11/44 = 0.25.
Q20. Chemistry
The catalyst used in the contact process for H₂SO₄ is:
Correct Answer: A
Contact process uses V₂O₅ (vanadium pentoxide) as catalyst.
Q21. Biology
Which vitamin is water soluble?
A. Vitamin A
B. Vitamin D
C. Vitamin C
D. Vitamin K
Correct Answer: C
Vitamin C and B-complex are water-soluble. A, D, E, K are fat-soluble.
Q22. Biology
The largest gland in the human body is:
A. Pancreas
B. Liver
C. Salivary gland
D. Thyroid
Correct Answer: B
Liver is the largest gland (~1.5 kg) and performs 500+ functions.
Q23. Biology
Which of these is a prokaryote?
A. Amoeba
B. Bacteria
C. Yeast
D. Paramecium
Correct Answer: B
Bacteria are prokaryotes (no membrane-bound nucleus/organelles).
Q24. Biology
The universal donor blood group is:
Correct Answer: D
O negative is universal donor (no A/B antigens, no Rh factor).
Q25. Biology
The respiratory pigment in human blood is:
A. Chlorophyll
B. Hemoglobin
C. Melanin
D. Myoglobin
Correct Answer: B
Hemoglobin in RBCs transports O₂ from lungs to tissues.
Q26. Biology
Which part of the brain controls balance and coordination?
A. Cerebrum
B. Cerebellum
C. Medulla
D. Hypothalamus
Correct Answer: B
Cerebellum coordinates voluntary movements, balance, and posture.
Q27. Biology
The number of chromosomes in human cells is:
Correct Answer: B
Humans have 23 pairs = 46 chromosomes (22 autosomes + 1 sex chromosome pair).
Q28. Biology
The disease caused by deficiency of insulin is:
A. Goiter
B. Diabetes mellitus
C. Anemia
D. Rickets
Correct Answer: B
Diabetes mellitus is caused by insufficient insulin production or insulin resistance.
Q29. Biology
The DNA structure was discovered by:
A. Mendel
B. Darwin
C. Watson and Crick
D. Pasteur
Correct Answer: C
Watson and Crick proposed the double helix structure of DNA in 1953.
Q30. Biology
Which chamber of the heart pumps blood to the lungs?
A. Left atrium
B. Left ventricle
C. Right atrium
D. Right ventricle
Correct Answer: D
Right ventricle pumps deoxygenated blood to lungs via pulmonary artery.