2022Flame Institute

Which among the following do you consider as the best evidence to show that two species of algae are closely related

(a) They both respire and release CO2 (b) They both are found in the same habitat (c) They both reproduce asexually (d) They both have same type of pigments Ans.d (7)

The non-motile, greatly thickened asexual spores are called

(a) Hypnospores (b) Aplanospores (c) Macrozoospores (d) Microzoospores Ans. a (7)

67. When a weight of 10 kg is suspended from a copper wire of length 3 metres and diameter 0.4 mm, its length increases by 2.4 cm. If the diameter of the wire is doubled, then the extension in its length will be

(a) 9.6 cm (b) 4.8 cm (c) 1.2 cm (d) 0.6 cm Answer-d (18)

22. In biotechnological studies, the alga that is exploited as a rich source of protein is

(a) Spirogyra (b) Spirulina (c) Chlamydomonas (d) Scytonema Ans. b (9)

154. A disc of radius R is made to oscillate about a horizontal axis passing through its periphery. Its time period would be

(a) 2π√(3R/2g) (b) 2π√(2R/3g (c) 2π√(R/g) (d) 2π√(2R/g) Ans. a (66)

153. A metre scale is suspended vertically from a horizontal axis passing through one end of it. Its time period would be

(a) 1.64 sec (b) 2 sec (c) 2.5 sec (d) 3.2 sec Ans. a (52)

152. In the above problem the angular velocity of the cylinder, after the masses fall down through distance h, will be

(a) 1/R√{(8 mgh)/(M+4m)} (b) 1/R√{8 mgh/(M+m)} (c) 1/R√{mgh/(M+m)} (d) 1/R √{8 mgh/(M+2m)} Ans. a (27)

If the radius and acceleration due to gravity both are doubled, escape velocity of earth will become

(a) 11.2 km/s (b) 22.4 km/s (c) 5.6 km/s (d) 44.8 km/s Answer: b (6)

If the radius of a planet is four times that of earth and the value of g is same for both, the escape velocity on the planet will be

(a) 11.2 km/s (b) 5.6 km/s (c) 22.4 km/s (d) None Answer: c (4)

An example of agarophyte is

(a) Dictyota (b) Fucus (c) Nostoc (d) Gelidium Ans. d (10)

Algal cell wall is composed of

(a) Chitin (b) Cutin (c) Cellulose (d) Suberin Ans. c (9)

Which one is a parasitic algae

(a) Vaucheria (b) Polysiphonia (c) Cephaleuros (d) Batrachospermum Ans. c (37)

The velocity with which a projectile must be fired so that it escapes earth’s gravitation does not depend on

a) Mass of the earth (b) Mass of the projectile (c) Radius of the projectile’s orbit (d) Gravitational constant Answer: b (6)

147. A mass M is supported by a mass less string would wound a uniform cylinder of mass M and radius R. On releasing the mass from rest, it will fall with acceleration

(a) g (b) g/2 (c) g/3 (d) 2g/3 Ans. d (4)

The biodegradable polymer is

a. Buna- s b. Nylon-6, 6 c. Nylon 2-nylon 6 d. Nylon- 6 Ans. c (13)

59. Which of the following statements is correct

(a) Hooke’s law is applicable only within elastic limit (b) The adiabatic and isothermal elastic constants of a gas are equal (c) Young’s modulus is dimensionless (d) Stress multiplied by strain is equal to the stored energy Answer-a (40)

If V, R and g denote respectively the escape velocity from the surface of the earth radius of the earth, and acceleration due to gravity, then the correct equation is

(a) V=√gR (b) V=√ 4/3 gR 3 (c) V = R√g (d) …

Gametes formed by meiosis are called

(a) Coenogametes (b) Meiogametes (c) Mitogametes (d) None of these Ans. b (27)

A motile flagellated asexual cell is called

(a) Sperm (b) Zoospore (c) Oospore (d) Androspore Ans. b (20)

The escape velocity for a body projected vertically upwards from the surface of earth is 11 km/s. If the body is projected at an angle of 45o with the vertical, the escape velocity will be

(a) ( 11/√2 )km/s (b) 11√2km/s (c) 22 km/s (d) 11 km/s Answer: d (3)

Fusion of mature individuals which directly act as gametes, is called

(a) Isogamy (b) Anisogamy (c) Hologamy (d) Autogamy Ans. c (9)

In physiological anisogamy

(a) Gametes are morphologically similar but physiologically dissimilar (b) Gametes are morphologically dissimilar but physiologicaly similar (c) Gametes are morphologically and physiologically similar (d) None of the above Ans. a (9)

Which one of the following is not a accessory pigment

(a) Chlorophyll ‘a‘ (b) Chlorophyll ‘e‘ (c) Phycocyanin (d) Xanthophyll Ans. a (6)

Coenobium means

(a) A hollow spherical colony (b) A group of filaments (c) Palmelloid form (d) None of the above Ans. a (7)

Iodine is obtained from the members of

(a) Green algae (b) Brown algae (c) Red algae (d) Blue–green algae Ans. b (7)

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 same stress but different strains Answer-d (11)

Which of the following polymer is biodegradable

Ans. c (6)

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 (d) Copper Answer-c (9)

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 both assertion and reason are true but reason is not the correct explanation of the assertion. c. if assertion is …