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Question 1

The organisms living in arctic and antarctic climatic zones are called

1. Megatherms

2. Mesotherms

3. Microtherms

4. Hekistotherms

Question 2

Meloidogyne incognitia majorly infects:

1. Stem of cotton plant

2. Roots of tobacco plants

3. Stem of tobacco plant

4. Roots of cotton plants

Question 3

The term chromosome was given by :

1. Johnson

2. Waldeyer

3. Benda

4. De Duve

Question 4

Natality refers to: (NEET UG 2018)

1. Number of individuals leaving the habitat

2. Birth rate

3. Death rate

4. Number of individuals entering a habitat

Question 5

Cork is an excellent material for making bottle stoppers since it is:

1. cheap

2. easily available

3. airtight

4. light

Question 6

A water jet emerges from a hose pipe of diameter 20 cm with a speed of 20 cm s⁻¹ and strikes a man inelastically. The force exerted by the jet on the person is

1. 5.04 N

2. 1.26 N

3. 2.52 N

4. 9.4 N

Question 7

The frequency for maximum energy radiation of an ideal black body at temperature T is ν_m. If Wien's constant is b and the velocity of heat radiation in vacuum is c, then:

1. ν_m = b/T

2. ν_m = b/cT

3. ν_m = cT/b

4. ν_m = bT/c

Question 8

When a dielectric slab is inserted between the plates of one of two identical capacitors A and B connected in series across a battery, then

1. the charge on A increases, the p.d. across A increases, the p.d. across B decreases and the charge on B increases

2. the charge on A increases, the p.d. across A increases, the p.d. across B decreases and the charge on B decreases

3. the charge on A decreases and the p.d. across both decreases

4. nothing changes

Question 9

A student measures the time period of 100 oscillations of a simple pendulum four times, obtaining 90 s, 91 s, 95 s and 92 s. If the smallest division on the measuring clock is 1 s, the reported mean time should be

1. 92 ± 2 s

2. 92 ± 5.0 s

3. 92 ± 1.8 s

4. 92 ± 3 s

Question 10

Which one of the following processes depends on gravity? [AIPMT 2000]

1. Conduction

2. Convection

3. Radiation

4. None of these

Question 11

Substances misused by certain sportspeople to enhance performance include:

1. Narcotic analgesics

2. Anabolic steroids

3. Diuretics and certain hormones

4. All of these

Question 12

Fertilisation results in the formation of a:

1. Morula

2. Blastocyst

3. Zygote

4. Gastrula

Question 13

Areolar connective tissue joins

1. bones with bones

2. fat body with muscles

3. integument with muscles

4. bones with muscles

Question 14

Ascaris lumbricoides primarily causes disease of the:

1. Liver

2. Lungs

3. Intestine

4. Kidney

Question 15

The contraceptive method which is highly effective but reversibility is very poor is:

1. Barrier method

2. Surgical method

3. IUDs

4. Traditional method

Question 16

Solid Ca(HCO₃)₂ decomposes as Ca(HCO₃)₂(s) ⇌ CaCO₃(s) + CO₂(g) + H₂O(g). If the total pressure is 0.2 atm at 420 K, the standard free energy change (ΔᵣG°) is:

1. 840 kJ/mol

2. 3.86 kJ/mol

3. 6.98 kJ/mol

4. 16.083 kJ/mol

Question 17

A chemical reaction A ⇌ B is said to be in equilibrium when:

1. Complete conversion of A to B has taken place

2. Conversion of A to B is only 50% complete

3. Only 10% conversion of A to B has taken place

4. The rate of transformation of A to B is just equal to the rate of transformation of B to A

Question 18

For a first-order decomposition A → A₁, A₂, … Aₙ by parallel paths with rate constants k₁, k₂, … kₙ, the overall k is given by:

1. k = k₁ + k₂ + … + kₙ

2. k = (k₁ + k₂ + … + kₙ)/n

3. k = k₁ × k₂ × … × kₙ

4. none of these

Question 19

The basicity of orthophosphoric acid is

1. 2

2. 3

3. 4

4. 5

Question 20

In the ammonolysis of alkyl halides, the halogen atom is replaced by an amino group. Which represents the correct order of reactivity of halides with amines?

1. RBr > RI > RCl

2. RI > RCl > RBr

3. RI > RBr > RCl

4. RCl > RBr > RI

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