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2022

Home2022Page 68

82. In which case there is maximum extension in the wire, if same force is applied on each wire

(a)  L = 500 cm, d = 0.05 mm (b)   L = 200 cm, d = 0.02 mm (c)   L...

Which of the following is obtained from algae

(a)  Wax                                    (b)  Butter (c)   Chocolate                           (d)  Carragenin Ans. d (8)

The element present in thyroxin is obtained from

(a)  Laminaria                          (b)  Polysiphonia (c)   Porphyra                            (d)  Gelidium Ans. a (6)

Red rust of tea is caused by

(a)  Cephaleuros                       (b)  Synchytrium (c)   Mucor                                 (d)  Fusarium Ans. a (12)

Brown algae is characterised by the presence of

(a)  Phycocyanin                      (b)  Phycoerythrin (c)   Fucoxanthin                      (d)  Haematochrome Ans. c (9)

Select the correct statement from the following

(a)      The orbital velocity of a satellite increases with the radius of the orbit (b)  Escape velocity of a particle...

In which of the following algal classes the starch and oil are present

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

If r represents the radius of the orbit of a satellite of mass m moving around a planet of mass M, the velocity of the satellite is given by

(a)   v2 = g(M/r)                                 ...

Amongst plants which one of the following group has been classified on the basis of pigments

(a)  Algae                                  (b)  Fungi (c)   Bryophyta                         (d)  Pteridophyta Ans. a (10)

Pyrenoids are characteristically found in the chloroplast of

(a)  Fungi                                  (b)  Algae (c)   Pteridophytes                   (d)  Angiosperms Ans. b (43)

Floridean starch is found in

(a)  Chlorophyceae                  (b)  Rhodophyceae (c)   Myxophyceae                    (d)  Cyanophages Ans. b (5)

A filament of an alga can be differentiated from that of a fungus by

(a)  Cells are uninucleate in algae whereas they are multinucleate in fungi (b)  Chlorophyll present in algae and absent in...

Pyrenoids are the centre of formation of

(a)  Enzymes                            (b)  Proteins (c)   Fats                                    (d)  Starch Ans. d (7)

73. A fixed volume of iron is drawn into a wire of length L. The extension x produced in this wire by a constant force F is proportional to

(a) 1/L2                                     ...

Sporophytic generation is represented by zygote only in

(a)  Funaria                               (b)  Chlamydomonas (c)   Pinus                                  (d)  Selaginella Ans. b (9)

75. To keep constant time, watches are fitted with balance wheel made of

(a)  Invar                                                (b)   Stainless steel (c)   Tungsten                           ...

Rhodophyceae is red coloured due to

(a)  Xanthophyll (b)  Carotenoids (c)   g–phycoerythrin (d)  g–phycocyanin Ans.c (7)

Four particles each of mass M, are located at the vertices of a square with side L. The gravitational potential due to this at the centre of the square is

Answer: a (30)

Algae are in the same major group of plants as are the

(a)  Mosses                               (b)  Liverworts (c)   Fungi                                  (d)  Ferns Ans. c (11)

Alga rich in protein is

(a)  Chlorella                            (b)  Spirogyra (c)   Oscillatoria                         (d)  Ulothrix Ans. a (19)

There are two planets. The ratio of radius of the two planets is K but ratio of acceleration due to gravity of both planets is g. What will be the ratio of their escape velocity

(a)     ( Kg )1/2                           (b) ( Kg...

Red eye spot containing haematochrome is meant for

(a)  Photosynthesis                 (b)  Respiration (c)   Photoreception                 (d)  Movements Ans. c (7)

Pyrenoids are made up of

(a)  Core of starch surrounded by sheath of protein (b)  Core of protein surrounded by fatty sheath (c)   Proteinaceous centre...

Algae are important, we should study algae because

(a)  They are good organisms to experiment with (b)  They can be grown in large tank cultures (c)   They may...

76. A wire is stretched by 0.01 m by a certain force F. Another wire of same material whose diameter and length are double to the original wire is stretched by the same force. Then its elongation will be

(a)  0.005 m                                          (b)   0.01 m (c)   0.02 m                       ...

All cells of sex organs are formed gametes in

(a)  Algae                                  (b)  Bryophyta (c)   Pteridophyta                     (d)  Gymnosperm Ans.a (8)

Palmella stage is produced

(a)  In rainy season (b)  During unfavourable conditions (c)   During favourable conditions (d)  None of the above Ans. b (10)

Zygospore is

(a)  Haploid                              (b)  Polyploid (c)   Diploid                               (d)  None of the above Ans. c (44)

77. The possible value of Poisson’s ratio is

(a)  1                                     ...

Thermal algae are forms which grow and survive

(a)  In tropical regions where the temperature range is high (b)  In hot water springs where the temperature remains around...

The value of escape velocity on a certain planet is 2 km/s. Then the value of orbital speed for a satellite orbiting close to its surface is

(a)  12 km/s                             (b)  1 km/s (c) √2   km/s                           (d)   2√2   km/s Answer: c (8)

The simplest green plants are

(a)  Yeast                                  (b)  Bacteria (c)   Algae                                  (d)  Lactobacillus Ans.c (7)

Which one of the following statements concerning the algae is wrong

(a)  Most algae are photosynthetic (b)  Algae can be classified according to their pigments (c)   All algae are filamentous (d) ...

23. More than one pyrenoid are present in

(a)  Ulothrix                              (b)  Spirogyra (c)   Oedogonium                       (d)  All the above Ans. d (14)

Algae which form motile colony is

(a)  Volvax                                (b)  Nostoc (c)   Spirogyra                           (d)  Chlamydomonas Ans. b (9)

For a satellite moving in an orbit around the earth, the ratio of kinetic energy to potential energy is

(a)   2                                      (b) 1/2 (c)   1/√2                             ...

70. Density of rubber is d. A thick rubber cord of length L and cross-section area A undergoes elongation under its own weight on suspending it. This elongation is proportional to

(a)    dL                                     ...

Assertion : The time of vulcanisation and temperature is increased by adding accelerators. Reason : By vulcanising, a material of high tensile strength can be obtained.

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

155. A solid cube of side l is made to oscillate about a horizontal axis passing through one of its edges. Its time period will be

Ans. a (44)

69. Two wires ‘A’ and ‘B’ of the same material have radii in the ratio 2 : 1 and lengths in the ratio 4 : 1. The ratio of the normal forces required to produce the same change in the lengths of these two wires is

(a)   1 : 1                                 ...

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