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May 21, 2022

Home2022May21Page 7

Iodine is obtained from the members of

(a)  Green algae                       (b)  Brown algae (c)   Red algae                           (d)  Blue–green algae Ans. b (10)

63. A copper wire and a steel wire of the same diameter and length are connected end to end and a force is applied, which stretches their combined length by 1 cm. The two wires will have

(a)   Different stresses and strains (b)  The same stress and strain (c)   The same strain but different stresses (d)  The...

Which of the following polymer is biodegradable

Ans. c (7)

62. Which one of the following quantities does not have the unit of force per unit area

(a)      Stress (b)    Strain (c)   Young’s modulus of elasticity (d)     Pressure Answer-b (5)

61. Which one of the following substances possesses the highest elasticity

(a)      Rubber                                      (b)  Glass (c)   Steel                             ...

Assertion : 1, 3- Butadiene is the monomer for natural rubber. Reason : Natural rubber is formed through anionic addition polymerization.

a. If both assertion and reason are true and the reason is the correct explanation of the assertion. b. If...

Assertion : Teflon has high thermal stability and chemical inerthness. Reason : Teflon is a thermoplastic

a. If both assertion and reason are true and the reason is the correct explanation of the assertion. b. If...

Assertion : In Vulcanisation of rubber, sulphur cross links are introduced. Reason : Vulcanisation is a free radical initiated chain reaction.

a. If both assertion and reason are true and the reason is the correct explanation of the assertion. b. If...

In the life cycle of which group flagellated cells are not formed

(a)  Chlorophyceae                  (b)  Phaeophyceae (c)   Rhodophyceae                  (d)  Both (b) and (c) Ans. c (13)

Example of coenocytic algae is

(a)  Vaucheria                           (b)  Chara (c)   Nostoc                                (d)  Polysiphonia Ans. a (35)

Agar–Agar is obtained from

(a)  Gigartina                            (b)  Gelidium (c)   Gracillaria                          (d)  All the above Ans. d (9)

Escape velocity on the surface of earth is 11.2 km/s . Escape velocity from a planet whose mass is the same as that of earth and radius 1/4 that of earth is

(a)  2.8 km/s                            (b)  15.6 km/s (c)   22.4 km/s                          (d)  44.8 km/s Answer: c (15)

Botanical name of sea palm is

(a)  Polysiphonia                      (b)  Postelsia (c)   Ectocarpus                         (d)  Macrocystis Ans. b (16)

Sexual reproduction and mobile cells are absent in

(a)  Chlorophyceae                  (b)  Myxophyceae (c)   Rhodophyceae                  (d)  Phaeophyceae Ans. b (9)

The classification of algae is based on

(a)  Type of pigment (b)  Nature of cell wall material (c)   Nature of reserve food (d)  All the above Ans....

Who is popularly known as the “Father of Phycology”

(a)  Fritsch                                (b)  Papenfus (c)   Smith                                 (d)  Morris Ans. a (8)

Phycology is the study of

(a)  Algae                                  (b)  Fungi (c)   Bacteria                             (d)  All the above Ans. a (56)

1. Who is regarded as the “Father of Indian Phycology”

(a)  Prof. M.O.P. Iyenger         (b)  Prof. J.N. Mishra (c)   Prof. R.R. Mishra               (d)  Prof. R.N. Singh Ans. a (11)

65. A wire extends by 1 mm when a force is applied. Double the force is applied to another wire of same material and length but half the radius of cross-section. The elongation of the wire in mm will be

(a)   8                                     ...

Which one of the following sets forms the biodegradable polymer

Ans. b (15)

Escape velocity on the earth

(a)  Is less than that on the moon (b)  Depends upon the mass of the body (c)   Depends upon the...

Buna – S is a polymer of

a. Butadiene only b. Butadiene and styrene c. Sturene only d. Butadiene  nitryl Ans. b (16)

On complete hydrogenation, natural rubber produces

a. Ethylene- propylene copolymer b. Vulcanised rubber c. Polypropylene d. Polybutylene Ans.  a (8)

Ebonite is

a. Polropene b. Natural rubber c. Synthetic rubber d. Highly vulcanized rubber Ans. d (8)

Which of the following statement is correct regarding the drawbacks of raw rubber

a. It is plastic in nature b. It has little durability c. It has large water-absorption capacity d. All of...

What is the percentage of sulphur used in vulcanization of rubber

a. 05% b. 03% c. 30% d. 55.0% Ans. a (8)

Natural rubber has

a. All cis- configuration b. All trans-configuration c. Alternate cis – and trans-configuration d. Random cis-and trans-configuration Ans. a (9)

Buna – N synthetic rubber is a copolymer of

Ans. c (10)

Which of the following is used in vulcanization of rubber

a. SF6 b. CF4 c. Cl2 F2 d. C2 F2 Ans. a (15)

The synthetic polymer which resembles natural rubber is

a. Neoprene b. Chloroprene c. Glyptal d. Nylon Ans. a (9)

The monomer of natural polymer rubber is

a. Neoprene b. Isoprene c. Chloroprene d. Butadiene Ans. b (8)

Heating of rubber with sulphur is known as

a. Galvanisation b. Vulcanisation c. Bessemerisation d. Sulphonation Ans. b (12)

151. A uniform solid cylinder of mass M and radius R rotates about a frictionless horizontal axle. Two similar masses suspended with the help two ropes wrapped around the cylinder. If the system is released from rest then the acceleration of each mass will be

(a) 4mg/M+2m (b) 4mg/M+4m (c)  2mg/M+m (d) 2mg/M+2m Ans. b (30)

150. A cylinder of mass M and radius r is mounted on a frictionless axle over a well. A rope of negligible mass is wrapped around the cylinder and a bucket of mass m is suspended from the rope. The linear acceleration of the bucket will be

(a)  Mg/M+2m (b)  2Mg/m+2M (c)  Mg/2M+m (d) 2mg/M+2m Ans. d (121)

149. A massless string is wrapped round a disc of mass M and radius R. Another end is tied to a mass m which is initially at height h from ground level as shown in the fig. If the mass is released then its velocity while touching the ground level will be

(a)  √(2gh) (b)  √(2gh)M/m (c)  √(2ghm/M) (d) √(4mgh/2m+M) Ans. d (94)

148. A uniform disc of radius R and mass M can rotate on a smooth axis passing through its centre and perpendicular to its plane. A force F is applied on its rim. See fig. What is the tangential acceleration

(a) 2F/M (b) F/M (c)  F/2M (d) F/4M Ans. a (39)

The escape velocity of a rocket launched from the surface of the earth

(a)  Does not depend on the mass of the rocket (b)  Does not depend on the mass of the earth...

If acceleration due to gravity on the surface of a planet is two times that on surface of earth and its radius is double that of earth. Then escape velocity from the surface of that planet in comparison to earth will be

(a)  2 ve                                     (b)  3 ve (c)  4 ve                     ...

Neoprene (Synethetic Rubber) is a polymer of

a. propene b. Vinyl chloride c. Chloroprene d. Butadiene Ans.c (6)

If the radius of a planet is R and its density is p , the escape velocity from its surface will be

(a)  ve ∝ pR                           (b) ve ∝√pR (c) ...
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