Question 1

A biconvex lens of refractive index ' μ', behaves as a divergent lens in water and behaves as a convergent lens in air. The refractive index of water is 1.33 and that of air is 1. Which of the following is true?
A) μ < 1
B) μ > 1.33
C) 1 < μ < 1.33
D) μ = 1

Question 2

____ is the screen on which light entering an eye, after refraction forms a real image.
A) iris
B) retina
C) pupil
D) cornea

Question 3

A resistor of length 1 m having uniform area of cross-section 0.020 cm² has a resistance of 2 Ω. Its specific resistance is ____.
A) 0.4 ohm cm
B) 0.04 ohm cm
C) 0.0004 ohm cm
D) 0.004 ohm cm

Question 4

Current carrying conductor placed in a magnetic field experiences a force. The device based on the principle is ____.
A) electrical generator
B) electric motor
C) electric bell
D) transformer

Question 5

The balanced chemical equation for the following reaction with the physical states of reactants and products is ____.

"Potassium metal reacts with water to give potassium hydroxide solution and hydrogen gas."

A) 2K(s)  + 2H₂O(l)  → 2KOH(aq)  + H₂(g)
B) K(s)  + H₂O(g)  → KOH(l)  + H₂(g)
C) K(s)  + 2H₂O (aq)  → 2KOH(s)  + H₂(g)
D) 2K(s)  + 2H₂O(aq)  → KOH(s)  + 2H₂(g)

Question 6

H₂CO₃ is a ____.
A) strong acid
B) weak acid
C) weak base
D) strong base

Question 7

The cation in MgCl₂ is ____.
A) Mg⁺⁺
B) Mg⁺
C) Cl
D) Cl ^-

Question 8

Which of the following does not give brisk effervescence with baking soda?
A) Methanoic acid
B) Propanoic acid
C) Ethanoic acid
D) Ethane

Question 9

When a gene exists in more than one form, the different forms are called ____.
A) Alleles
B) Genotypes
C) Heterozygotes
D) Phenotypes

Question 10

The process in which a parent organism breaks up naturally to produce two or more daughter organisms is ____.
A) regeneration
B) fragmentation
C) budding
D) fission