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May 2022

Home2022MayPage 37

If radius of the earth contracts 2% and its mass remains the same, then weight of the body at the earth surface

(a)      Will decrease                     (b)  Will increase (c)   Will remain the same      ...

If the radius of the earth shrinks by 1.5% (mass remaining same), then the value of acceleration due to gravity changes by

(a)      1%                                  (b)   ...

Where will it be profitable to purchase 1 kilogram sugar

(a)      At poles                          (b)  At equator (c)   At...

24. Assertion : A body subjected to three concurrent forces cannot be in equilibrium. Reason : If large number of concurrent forces acting on the same point, then the point will be in equilibrium, if sum of all the forces is equal to zero.

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

25. Assertion : Impulse and momentum have different dimensions. Reason : From Newton’s second law of motion, impulse is equal to change in momentum.

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

23. Assertion : A table cloth can be pulled from a table without dislodging the dishes. Reason : To every action there is an equal and opposite reaction.

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

22. Assertion : A reference frame attached to earth is an inertial frame of reference. Reason : The reference frame which has zero acceleration is called a non inertial frame of reference.

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

21. Assertion : Newton’s third law of motion is applicable only when bodies are in motion. Reason : Newton’s third law applies to all types of forces, e.g. gravitational, electric or magnetic forces etc.

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

Let g be the acceleration due to gravity at earth’s surface and K be the rotational kinetic energy of the earth. Suppose the earth’s radius decreases by 2% keeping all other quantities same, then

(a)      g decreases by 2% and K decreases by 4% (b)  g decreases by 4% and K increases by 2%...

Radius of earth is around 6000 km. The weight of body at height of 6000 km from earth surface becomes

(a)      Half                                  (b)   ...

A satellite revolves around the earth in an elliptical orbit. Its speed

(a)      Is the same at all points in the orbit (b)  Is greatest when it is closest to the earth...

Alginic acid is obtained from

(a)  Red algae                           (b)  Green algae (c)   Diatoms                             (d)  Brown algae Ans. d (11)

20. Assertion : Linear momentum of a body changes even when it is moving uniformly in a circle. Reason : In uniform circular motion velocity remain constant.

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

A small satellite is revolving near earth’s surface. Its orbital velocity will be nearly

(a)      8 km/sec                            (b)  11.2 km/sec (c)   4 km/sec                            (d)  6 km/sec Answer: a (12)

19. Assertion : The acceleration produced by a force in the motion of a body depends only upon its mass. Reason : Larger is the mass of the body, lesser will be the acceleration produced.

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

A geostationary satellite

(a)      Revolves about the polar axis (b)  Has a time period less than that of the near earth satellite (c)  ...

18. Assertion : A player lowers his hands while catching a cricket ball and suffers less reaction force. Reason : The time of catch increases when cricketer lowers its hand while catching a ball.

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

17. Assertion : In the case of free fall of the lift, the man will feel weightlessness. Reason : In free fall, acceleration of lift is equal to acceleration due to gravity.

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

Which of the following form contain algae

(a)  Equisetum                          (b)  Selaginella (c)   Marsilea                             (d)  None of these Ans. d (16)

16. Assertion : When the lift moves with uniform velocity the man in the lift will feel weightlessness. Reason : In downward accelerated motion of lift, apparent weight of a body decreases.

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

In chlamydomonas the meiosis occurs in

(a)  Gamete                              (b)  Zygote (c)   Sporogonium                    (d)  Zoospore Ans. b (7)

Weight of 1 kg becomes 1/6 on moon. If radius of moon is  1.768× 106m , then the mass of moon will be

(a)      1.99×1030 kg                          (b)  7.56×1022  kg...

Two satellites A and B go round a planet P in circular orbits having radii 4R and R If the speed of the satellite A is 3V, the speed of the satellite B will be.

  (a)      12 V                (b)    6 V (c)     4/3  V   ...

Reserve food material of algae is

(a)  Starch                                (b)  Glycogen (c)   Fat                                      (d)  Sugar Ans. a (12)

Pyrenoids in green algal cells are related to

(a)  Starch formation (b)  Protein storage (c)   General metabolism (d)  Enzyme secretion Ans. a (10)

Algae attached to stone is called

(a)  Epilithic                             (b)  Epifolic (c)   Coenolithic                        (d)  None of these Ans. a (6)

Agranal chloroplast are found in

(a)  Bryophytes                        (b)  Gymnosperms (c)   Green algae                       (d)  Angiosperms Ans. c (6)

Agar agar is obtained from

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

In oogamy, fertilization involves

(a)  A large non-motile female gamete and a small non-motile male gamete (b)  A large motile female gamete and a...

The relay satellite transmits the T.V. programme continuously from one part of the world to another because its

(a)      Period is greater than the period of rotation of the earth (b)  Period is less than the period of...

Batrachospermum is found in

(a)  Marine water                    (b)  Fresh water (c)   Tree                                   (d)  Arctic zone Ans. b (10)

The thallus of Volvox is called

(a)  Trichome                           (b)  Coenobium (c)   Coenocyte                          (d)  Parenchymatous Ans. b (10)

11. If a satellite is orbiting the earth very close to its surface, then the orbital velocity mainly depends on

(a)      The mass of the satellite only (b)  The radius of the earth only (c)   The orbital radius only (d) ...

Sea weeds are important source of

(a)  Chlorine                             (b)  Fluorine (c)   Iodine                                (d)  Bromine Ans. a (9)

The period of a satellite in a circular orbit around a planet is independent of

(a)      The mass of the planet (b)  The radius of the planet (c)   The mass of the satellite (d)  All...

Thallophyta includes

(a)  Fungi and bryophyta (b)  Algae and bryophyta (c)   Algae, fungi and bryophyta (d)  Algae and fungi Ans. d (10)

The mean radius of the earth is R, its angular speed on its own axis is ω  and the acceleration due to gravity at earth’s surface is g. The cube of the radius of the orbit of a geostationary satellite will be  

(a)     R2g/ ω                                ...

25. Orbital velocity of earth’s satellite near the surface is 7 km/s. When the radius of the orbit is 4 times than that of earth’s radius, then orbital velocity in that orbit is

(a)      3.5 km/s                           (b)  7 km/s (c)   72...

The time period of a geostationary satellite is

(a)      24 hours                       (b)  12 hours (c)       ...

Orbital velocity of an artificial satellite does not depend upon

(a)      Mass of the earth (b)  Mass of the satellite (c)   Radius of the earth (d)  Acceleration due to gravity...
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