A spring is stretched by applying a load to its free end. The strain produced in the spring is 

(1) Shear 

(2) Longitudinal 

(3) Volumetric 

(4) Longitudinal & Shear

In a dithecous anther, each pollen sac contain 1000 MMC. What is the total number of pollen-grains produced by the anther? 

(1) 16,000 

(2) 4,000 

(3) 32,000 

(4) 8,000

A person who has allergy, the type of antibody produced in his body is 

(1) IgE 

(2) IgA 

(3) 1gM 

(4) IgG

The number of oxygen atoms in 4.4 gm of CO₂ is, 

(1) 6 x 10²² 

(2) 12 x 10²³ 

(3) 1.2 x 10²³ 

(4) 6 x 10²³ 

HCl gas is covalent and NaCl is an ionic compound. This is because 

(1) Hydrogen is a non-metal 

(2) Electronegativity difference between H and Cl is less than 2.1 

(3) Sodium is highly electro positive 

(4) HCl is a gas

Which of the following is not true? 

(1) Natural rubber has ‘trans’ configuration at every double bond. 

(2) Natural rubber is 1, 4-polymer of isoprene. 

(3) In vulcanisation the rubber becomes harder and stronger. 

(4) Buna-S is a co-polymer of Butene and styrene. 

The increasing order of bond order of O_2,O⁺_2,O₂^{– –} is

(1) O₂,^{– –} O^–_2, O⁺_2, O₂

(2) O^2-_2, O^–₂, O_2, O⁺₂

(3) O⁺₂, O₂, O^–₂, O₂^{– –}

(4) O_2, O⁺_2, O^–_2, O₂^{– –}

The hybridisation of C in diamond, graphite and ethyne is in the order 

(1) sp³, sp², sp 

(2) sp², sp³ , sp 

(3) sp³, sp, sp² 

(4) sp, sp² , sp³ 

Electrophile that participates in nitration of benzene is 

(1) NO⁺₂ 

(2) NO^–₃ 

(3) NO⁺ 

(4) NO

Osmotic pressure of the solution can be increased by, 

(1) decreasing the temperature of the solution 

(2) diluting the solution 

(3) increasing the temperature of the solution 

(4) increasing the volume of the vessel