Biology (1–20)

1.

Which hormone directly stimulates Leydig cells to secrete testosterone?

A. FSH

B. LH

C. GnRH

D. Inhibin

2.

The incorrect statement regarding operon concept is:

A. Proposed by Jacob and Monod

B. Structural genes are polycistronic

C. Repressor binds operator gene

D. Promoter synthesizes mRNA

3.

A dihybrid cross produces 9:3:3:1 ratio due to:

A. Linkage

B. Independent assortment

C. Codominance

D. Incomplete dominance

4.

In C4 plants, initial fixation of CO₂ occurs in:

A. Bundle sheath cells

B. Mesophyll cells

C. Guard cells

D. Companion cells

5.

Which immunoglobulin can cross placenta?

A. IgA

B. IgM

C. IgG

D. IgE

6.

Exponential growth equation is:

A. Nt = N0 + rt

B. Nt = N0ert

C. Nt = rt/N0

D. Nt = K − N0

7.

The first stable product of Calvin cycle is:

A. RuBP

B. PGA

C. OAA

D. PEP

8.

A chromosome with centromere near one end is:

A. Metacentric

B. Submetacentric

C. Acrocentric

D. Telocentric

9.

Which enzyme joins Okazaki fragments?

A. Helicase

B. DNA polymerase I

C. Ligase

D. Primase

10.

Hardy-Weinberg equilibrium is disturbed by:

A. Random mating

B. Large population

C. Gene migration

D. Absence of mutation

11.

Human insulin consists of:

A. One polypeptide chain

B. Two polypeptide chains

C. Three polypeptide chains

D. Four polypeptide chains

12.

Pneumatophores are characteristic of:

A. Xerophytes

B. Hydrophytes

C. Halophytes

D. Mesophytes

13.

The oxygen dissociation curve shifts right due to:

A. Increased pH

B. Decreased CO₂

C. Increased temperature

D. Decreased temperature

14.

The functional unit of kidney is:

A. Neuron

B. Nephron

C. Alveolus

D. Osteon

15.

Secondary growth results from activity of:

A. Apical meristem

B. Intercalary meristem

C. Lateral meristem

D. Protoderm

16.

Ecological pyramid always upright for:

A. Biomass

B. Energy

C. Numbers

D. Producers

17.

Which is not a nitrogenous base?

A. Adenine

B. Guanine

C. Uracil

D. Ribose

18.

Crossing over occurs during:

A. Leptotene

B. Zygotene

C. Pachytene

D. Diplotene

19.

Origin of replication is called:

A. Ori

B. Op

C. Promoter

D. Terminator

20.

AIDS is caused by:

A. HTLV

B. HIV

C. HBV

D. HPV

Chemistry (21–35)

21.

The oxidation state of Cr in K₂Cr₂O₇ is:

A. +4

B. +5

C. +6

D. +7

22.

Which has maximum bond order?

A. O₂

B. O₂⁺

C. O₂⁻

D. O₂²⁻

23.

For first-order reaction, half-life is:

A. Dependent on concentration

B. Independent of concentration

C. Zero

D. Infinite

24.

The strongest reducing agent is:

A. Li

B. Na

C. K

D. Cs

25.

Hybridization in SF₆:

A. sp³

B. sp³d

C. sp³d²

D. d²sp

26.

pH of 10⁻⁸ M HCl is approximately:

A. 8

B. 7

C. 6.98

D. 5

27.

Which is aromatic?

A. Cyclobutadiene

B. Cyclopropenyl cation

C. Cyclooctatetraene

D. Cyclopentadienyl cation

28.

The IUPAC name of CH₃CH₂CHO:

A. Propanal

B. Propanone

C. Ethanal

D. Propanoic acid

29.

The unit of rate constant for zero-order reaction is:

A. s⁻¹

B. mol L⁻¹ s⁻¹

C. L mol⁻¹ s⁻¹

D. mol²L⁻²s⁻¹

30.

Which exhibits maximum hydrogen bonding?

A. CH₄

B. NH₃

C. HF

D. HCl

31.

The coordination number of Fe in [Fe(CN)₆]⁴⁻ is:

A. 2

B. 4

C. 6

D. 8

32.

Cannizzaro reaction is shown by:

A. Acetaldehyde

B. Formaldehyde

C. Acetone

D. Acetic acid

33.

Among halogens, highest electron affinity is:

A. F

B. Cl

C. Br

D. I

34.

The shape of XeF₄ is:

A. Tetrahedral

B. Square planar

C. Trigonal bipyramidal

D. Octahedral

35.

A spontaneous process has:

A. ΔG > 0

B. ΔG = 0

C. ΔG < 0

D. ΔH = 0

Physics (36–50)

36.

Dimensional formula of Planck's constant:

A. ML²T⁻¹

B. ML²T⁻²

C. MLT⁻¹

D. MLT⁻²

37.

Escape velocity from Earth is approximately:

A. 7.9 km/s

B. 11.2 km/s

C. 9.8 km/s

D. 5.6 km/s

38.

The SI unit of electric flux is:

A. N/C

B. NC⁻¹m²

C. Nm²C⁻¹

D. Both B and C

39.

A body moving with constant speed in a circle has:

A. Zero acceleration

B. Constant acceleration

C. Centripetal acceleration

D. Tangential acceleration only

40.

Young's modulus equals:

A. Stress/Strain

B. Strain/Stress

C. Force × Area

D. Pressure × Volume

41.

In SHM, acceleration is maximum at:

A. Mean position

B. Extreme position

C. Everywhere same

D. Quarter cycle

42.

The energy of a photon is:

A. mc²

B. hf

C. h/f

D. mv²

43.

For a transformer:

A. Frequency changes

B. Power always increases

C. Works on mutual induction

D. Works on self-induction only

44.

Which color has maximum wavelength?

A. Violet

B. Blue

C. Green

D. Red

45.

Magnetic field at center of circular loop:

A. μ₀I/2R

B. μ₀I/4R

C. μ₀I/R

D. μ₀I/8R

46.

The de Broglie wavelength is inversely proportional to:

A. Velocity

B. Momentum

C. Energy

D. Mass only

47.

A capacitor stores energy in:

A. Plates

B. Electric field

C. Magnetic field

D. Battery

48.

The work done in isothermal expansion of ideal gas is:

A. Zero

B. Positive

C. Negative

D. Infinite

49.

The refractive index of vacuum is:

A. 0

B. 1

C. 1.33

D. ∞

50.

The threshold frequency is related to:

A. Radioactivity

B. Photoelectric effect

C. Nuclear fusion

D. Compton effect

Answer Key

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