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April 2022

Home2022AprilPage 2

1. The law of limiting factor for photosynthesis was enunciated by

(a)  Blackman                           (b)  Hill (c)   Ruben                                (d)  Kalmen Answer: (a)  Blackman Explanation: (a) Blackman propounded the law of limiting factors....

52. Parchment paper is

(a)  Permeable membrane (b)  Impermeable membrane (c)   Semipermeable membrane (d)  None of these Ans. (c)           Which allow all solvents but...

48. Amit walks at a uniform speed of 4 km/hr and 4 hr after his start, Brijesh cycles after him at the uniform rate of 20 km/hr. How far from the starting point will Brijesh catch Amit?

अमित अपनी शुरुआत के बाद 4 किमी / घंटा और 4 घंटे की एक समान गति से चलता है, बृजेश...

50. Powerful imbibant is/are

(a)  Pure protein (gelatin)      (b)  Fungal hyphae (c)   Meristematic cells             (d)  All of them Ans.  (d)          Adsorption is the property...

47. When a person reduces his speed from 42 km/hr to 36 km/hr he takes 20 min more then his usual time taken. Find the usual time taken by him?

जब कोई व्यक्ति अपनी गति को 42 किमी / घंटा से घटाकर 36 किमी / घंटा करता है तो वह...

43. A runs twice as fast as B and B runs thrice as fast as C. The distance covered by C in 72 minutes, will be covered by A in:

A, B से दुगनी तेजी से दौड़ता है,  B, C. से तीन गुना तेज दौड़ता है। C द्वारा 72 मिनट...

35. The osmosis help in

(a)  Distribution of water across the cells (b)  Turgor of the guard cells (c)   Resistance to the frost (d)  All...

36. Osmosis is helpful to plant because

(a)  Growth of the young cells is brought about by osmotic pressure and turgor pressure of these cells (b)  Certain...

37. Osmosis can be demonstrated by

(a)  Potato osmoscope             (b)  Ganong’s respiroscope (c)   Microscope                        (d)  All the above Ans.   (a)  Potato osmoscope experiment proves that osmosis...

38. Permanent wilting percentage is that amount of water in the soil at which

(a)  Plant remain normal (b)  Plant show vigorous growth (c)   Plant is permanently wilted (d)  Plant undergoes temporary wilting Ans....

39. The plant undergoes wilting when

          (a)  Xylem is blocked (b)  Cambium is blocked (c)   Phloem is blocked (d)  Some roots...

43. Percentage of water left in the soil when a plant wilts, is known as

(a)  Turgidity (b)  Field capacity (c)   Water retaining power of the soil (d)  Wilting coefficient Ans.  (d)      In wilting coefficient,...

40. Car P starts from town X toward town y. Car Q stars from Y towards X. Both the cars start simultaneously and travel their meet after journeys at uniform speeds. XY = 200 km. Both cars meet after 2 hours. If P and Q had travelled in the same direction both the cars would have met in 4 hours. Find the speed of  P. 

कार P, शहर X से शहर y की ओर शुरू होती है। कार Q, Y की ओर से X की...

41. Wilting of a plant results from excessive

(a)  Respiration                        (b)  Photosynthesis (c)   Absorption                        (d)  Transpiration Ans.  (d)      Rapid transpiration causes mid-day leaf water deficit (temporary wilting). If...

40. In some plants, the leaves drop down during day while become normal during night

(a)  Due to temporary wilting (b)  Permanent wilting (c)   Both (a) and (b) (d)          None of the above Ans. a...

48. Imbibition is very significant property of

(a)  Hydrophilic surfaces        (b)  Hydrophobic surfaces (c)   Lipophilic surfaces           (d)  All the above Ans.  (a)           Hydrophilic surface is water loving...

49. If wood is kept under water, then it becomes swell due to activity of

(a)  Protein                               (b)  Cellulose (c)   Both (a) and (b)               (d)  Minerals Ans.      (c)   A dry wooden piece when soaked...

47. How water rises from the rhizoids of Riccia to its assimilatory filaments ? It is through

(a)  Osmosis                             (b)  Root pressure (c)   Capillary                            (d)  Transpiration pull Ans. (a)      Because cell wall of rhizoids and assimilatory filament...

44. Cells absorb water by

(a)  Osmosis                             (b)  Osmosis and imbibition (c)   Imbibition alone               (d)  Diffusion Ans.(b)      These are the processes in plants for uptake...

34. Which of the following is effected by hydration of solute molecules

(a)  Absorption                        (b)  Transpiration (c)   Osmosis                             (d)  None of the above Ans. (c)      Hydration of solute molecules changes the solution concentration...

42. Wheat grains before germination absorb water by

(a)  Endosmosis                       (b)  Exosmosis (c)   Plasmolysis                        (d)  Imbibition Ans. (d)      Breaking of the seed coat in germinating seeds is due to...

46. Busses start from a bus terminal with a speed of 20 km/hr at intervals of 10 minutes. What is the speed of a man coming from the opposite direction towards the bus terminal if he meets the buses at intervals of 8 minutes?

बसें बस टर्मिनल से 10 मिनट के अंतराल पर 20 किमी / घंटा की गति से शुरू होती हैं। 8...

45. How long will three persons starting at the same point and travelling at 4 km/hr, 6 km/hr and 8 km/hr around a circular track 2 km long take to meet at the starting point? 

तीन व्यक्ति 4 किमी / घंटा, 6 किमी / घंटा और 8 किमी / घंटा की दूरी पर एक गोल...

46. During osmosis, water moves through a membrane

FROM TO  (a) Low water potential High water potential  (b) High solute concen Low solute concen.  (c) High osmotic potential...

44. On a circular track, time taken by A and B to meet when travelling in the opposite directions is 1/4 of time taken when they travel in the same direction. Find the ratio of their speeds? 

एक वृत्त ट्रैक पर, A और B द्वारा मिलने का समय विपरीत दिशाओं में यात्रा करते समय लिया गया समय...

42. Ravi starts by car from Mumbai to Goa. After sometime he realise that he will cover only 75% of the distance in the scheduled time or takes 3 hour more therefore he doubles his speed immediately and thus manages to reach Goa exactly on time. Find the time after which Ravi changed his speed? 

रवि मुंबई से गोवा के लिए कार द्वारा यात्रा शुरू करता है। कुछ समय बाद उसे एहसास हुआ कि वह...

41. The distance between two points P and Q is 115 km. Two persons start at the same time but one travelling from P towards Q and the other travelling from Q towards P. If their respective speeds are 40 kmph and 52 kmph, where do they meet each other?

दो बिंदुओं P और Q के बीच की दूरी 115 किमी है। दो व्यक्ति एक ही समय में यात्रा शुरू...

45. Water moves across a selectively permeable membrane

  FROM TO  (a) Region of higher water-potential Region of lower water potential  (b) Lower water concentration Higher water concentration...

33. Plasmolysis can be used for

(a)  Good growth of plants     (b)  Good growth of weeds (c)   Killing the weeds              (d)  None of these Ans. c...

32. If a cell with incipient plasmolysis is placed in a hypertonic solution it will show

(a)  Deplasmolysis                   (b)  More plasmolysis (c)   Exosmosis                          (d)  None of these Ans.b (9)

31. Why jams and pickles are immersed in concentrated sugar solution or oil

(a)  They do not rot due to their own growth (b)  They do not rot due to fungal or bacterial...

29. Movement of particles of matter in the cell due to its own kinetic energy is called

(a)  Imbibition                         (b)  Diffusion (c)   Gummosis                          (d)  None of these Ans. (b)      Meaning of diffusion is to flow out or...

30. Exchange of gases between plant and atmosphere is governed by

(a)  Osmosis                             (b)  Diffusion (c)   Permeability of cell wall  (d)  None of the above Ans. b (42)

28. The process by which large molecules move out of the cell is called

(a)  Plasmolysis                        (b)  Deplasmolysis (c)   Phagocytosis                     (d)  Reverse phagocytosis Ans. (d)      Removal of large molecule from cell is also known as...

39. A person went from P to Q, at an average speed of a km/hr, from Q to R at an average speed of b km/hr, and from R to S at an average speed of the c km/hr. If PQ = QR = RS, then the average speed of the person for traveling from P to S was

(a) (a + b + c)/ 3 (b) 3abc/(ab + bc + ca) (c) 3abc/(a + b + c) (d)...

39. Ashok covered a distance of 225 km as follows. He covered the first 15 km at 45 km/hr, the next 120 km at 60 km/hr and the remaining journey at 90 km/hr. Find his average speed for the journey of 225 km

  अशोक ने निम्नानुसार 225 किमी की दूरी तय की। उन्होंने पहले 15 किमी को 45 किमी / घंटा, अगले...

38. A boy walking at a speed of 10 km/h reaches his school 12 min late. Next time at a speed of 15 km/h reaches his school 7 min late. Find the distance of his school from his house?

10 किमी / घंटा की गति से चलने वाला एक लड़का अपने स्कूल में 12 मिनट देरी से पहुंचता है।...

37. Walking at 7/8th  of his usual speed, a man reached his destination 16 minutes later than the time he usually takes to reach his destination. Find the usual time taken by him  to reach his destination.

अपनी सामान्य गति के 7/8 वें स्थान पर चलते हुए, एक व्यक्ति अपनी मंजिल तक पहुँचने के लिए आमतौर पर...

36. A man takes 5 hours 45 min in walking to a certain place and riding back. He would have gained 2 hours by riding both ways. The time he would take both walking:

एक आदमी को एक निश्चित स्थान पर चलने और वापस सवारी करने में 5 घंटे 45 मिनट लगते हैं। उसने...

34. Two trains start from P and Q respectively and travel towards each other at a speed of 50 km/hr and 40 km/hr respectively. By the time they meet, the first train has traveled 100km more then the second. The distance between P and Q is:

दो ट्रेनें क्रमशः P और Q से शुरू होती हैं और क्रमशः 50 किमी / घंटा और 40 किमी /...
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