SAFE HANDS NEET -IB PT 1 Date : 21/12/2017 TEST ID: 1 Time : 01:30:00 Marks : 360 PCB

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1 SAFE HANDS NEET -IB PT 1 Date : 21/12/2017 TEST ID: 1 Time : 01:30:00 Marks : 360 PCB PHYSICS 1) c 2) a 3) b 4) a 5) d 6) a 7) a 8) a 9) d 10) b 11) c 12) a 13) b 14) c 15) d CHEMISTRY 16) d 17) d 18) b 19) c 20) a 21) b 22) c 23) b 24) b 25) c 26) b 27) a 28) c 29) d 30) a : ANSWER KEY : 46) b 47) a 48) b 49) c 50) d 51) b 52) d 53) a 54) b 55) c 56) b 57) a 58) b 59) a 60) a BIOLOGY 31) d 32) a 33) c 34) b 35) b 36) b 37) a 38) c 39) a 40) a 41) b 42) d 43) d 44) b 45) b P a g e 5

2 SAFE HANDS NEET -IB PT 1 Date : 21/12/2017 TEST ID: 1 Time : 01:30:00 Marks : 360 PCB : HINTS AND SOLUTIONS : PHYSICS Single Correct Answer Type 1 (c) 2 (a) Energy 8 (a) When two particles moves towards each other then When these particles moves in the same direction then By solving and 9 (d) Given, 3 (b) One light year m/s year 4 (a) m s m Now, again differentiating Eq. (i), we get Maximum % error in 5 (d) Dimensional formula of magnetic flux Since, is negative, hence gives the maximum value for curve. Moreover, acceleration 6 (a) 7 (a) If a body starts from rest with acceleration and then retards with retardation and comes to rest. The total time taken for this journey is and distance covered is 10 (b) Average speed is the ratio of distance to time taken So, total distance Total time taken Hence, average speed P a g e 6

3 11 (c) Let man will catch the b f. So he will cover distance Similarly distance travelled by the bus will be Time 15 (d) For the given condition To find the minimum value of sp we get then, Then, 12 (a) Distance covered in 5 s Distance covered in 5 th second 14 (c) Total distance to be covered for crossing the bridge length of train length of bridge CHEMISTRY Single Correct Answer Type 16 (d) solution. 20 (a) Meq. of metal = Meq. of oxygen Here, is the limiting reactant. 2 moles of gives 1 mole of So, 0.2 mole of will give 0.1 mole of. 18 (b) Molarity is mole of solute present in one litre Now, Meq. of metal = Meq. of bromide 87% 21 (b) P a g e 7

4 Meq. of in mixture = ) f in mixture = ( f f in mixture = If this CO is completely oxidised to mole of formed f = then f H = f W f H 40 = 80 g 22 (c) b H b H Eq. at = Eq. after reaction Mole of b formed 24 (b) Angular momentum in an orbital 25 (c). 26 (b) Elements show characteristics line spectrum which is finger print of atom. 27 (a) Given, or H b y p p 28 (c) Symbols K L M N = = = Hence, the order of number of electrons in shell is 29 (d) Lyman series spectral lines have smaller thus, higher energy. 30 (a) is maximum for H-atom and. and BIOLOGY Single Correct Answer Type 31 (d) Father of Botany Theophrastus Father of Zoology/Biology Aristotle Father of Cytology Robert Hooke. 32 (a) The biological concept of species was formulated by Ernst Mayr. 33 (c) World first herbarium was set-up Pisa in Italy by professor of Botany Luca Ghine 34 (b) Allotropic species are those group of individuals, which occupy the same or overlapping area in the different habitat and involve geographical isolation. While sympatric species occur without geographic isolation. Sibling have same ancestors and when species have subgroup, it is called subspecies or variety 35 (b) In trinomial nomenclature a third name is written or printed after two words name, which indicate subspecies or variety or race of the organism, e.g., Indian babul (Acacia nilotica indica). Where indica means Indian species of babul 36 (b) Unicellular organisms are classified in kingdom- Monera, i.e., kingdom of prokaryotes of five P a g e 8

5 kingdom classification, rest four kingdom are assigned to eukaryotes 37 (a) RH Whittaker, an American taxonomist proposed live kingdom classification. His five kingdom are Monera, Protista, Fungi, Plantae and Animalia 38 (c) Phylogenetic system involves the classification of plants, according to the envolutionary and genetic affinities. This system of classification was proposed by Engler in 1886, by Hutchinson in 1926 and by Tippo in (a) Number and type of organisms it includes 40 (a) John Ray introduced the term Species in its presence sense for the first time. He also published a book Historia Generalis Plantarum 41 (b) is reindeer moss. It is a furticose lichen. It is used as food for reindeer, musk, ox and other wild animals of the Arctic Tundra zone. 42 (d) All are correct except (d). Noctiluca is a colourless dinoflagellate. This alga is famous for bioluminescence. Noctiluca (the night light) is a colourless dinoflagelate, which is an important constituent of coastal plankton of both temperature and tropical seas. This alga is famous for bioluminescence as it was the first dinoflagellate where bioluminescence was reported The cellular slime moulds have the characters of both plants and animals. The reproductive phase is plant-like, as the spores have a cell wall composed of cellulose. However, vegetative phase is animal like having no cell wall and feeding like Amoeba 43 (d) Bacteria are the most abundant microorganisms. A handful of soil may contain hundreds and thousands of them 44 (b) The main difference between Gram positive and Gram negative bacteria is due to cell wall. The cell wall of Gram negative bacteria contain Peptidoglycan (10%), lipopolysaccharides lipoprotein and phospholipid, while cell wall of Gram positive bacteria contain peptidoglycan (60-90%), teichoic acid and lipids. 45 (b) Sporozoan. Plasmodium is a sporozoan and a causative agent of malarian diseases. It is an endoparasite (present with in the body) and intercullar parasite 46 (b) All archaebacteria share certain key characteristics: (i) Their cell wall lack peptidoglycan (important component of cell wall of eubacteria). (ii) Lipids in cell membrane of archaebacteria have different structure than those in all other organisms (iii) Archaebacteria has distinct ribosomal RNA sequence. (iv) Some genes of archaebacteria possess, introns unlike those of other bacteria. 47 (a) AIDS is a disease of the human immune system which is caused by an infection with Human Immune deficiency Virus (HIV) 48 (b) All are correct except IV and V Some unicellular fungi like yeast, are used to make bread and beer, Ustilago is responsible for smut disease Puccinia graminis tritici is responsible for black rust of wheat 49 (c) R H Whittaker (1969) classified living organisms into five kingdoms based on cell structure, body organization, nutrition and life style. The five kingdoms are Monera, Protista, Fungi, Plantae and Animalia. 50 (d) Mesosomes are extensions of the plasma membrane within the bacterial cell (cytoplasm), involving complex whorls of convoluted membranes. 51 (b) Endosperm in angiosperms develops as a fusion product of secondary nucleus with male gamete. Secondary nucleus is diploid structure formed by fusion of haploid chalazal polar nucleus and haploid micropylar polar nucleus. Zygote is formed by the fusion of male gamete with egg 52 (d) Agar is obtained from Gelidium, Gracilaria, P a g e 9

6 Chondrus, Ceramium, etc., and used in microbiological works to solidify culture media. Green unicellular algae such as Chlorella and Chlamydomonas are used in sewage disposal ponds. They remove and restore by the process of photosynthesis and make the sewage water enhitable for many fishes and aerobic bacteria. Porphyra Laminaria and Sargassum are used as food 53 (a) Out of these, is a vascular cryptogam. 54 (b) Chlorophyll-a, xanthophylls and carotenoids. Gk; Phaios = brown, Phyton = plants Phaeophyceae cell contains more than one parietal chromatophores. The chromatophores contain chlorophyll-a and c -and -carotenes and xanthophylls. Besides, they contain large amount of brown coloured xanthophyll-fucoxanthin, which masks the green colour of chlorophylls and that is why these algae appear brown in colour 55 (c) In the microspore nucleus divides by a periclinal wall and forms a very small prothallial cell and large central cell. The central cell cuts off a second prothallial cell and antheridial cell. The nucleus of the antheridial cell divides to form generative cell and tube cell. Thus, the pollen grain of is sheded at four-celled stage when it consists of two vegetative prothallial cells, a generative cell and a tube cell. 56 (b) The haploid gametophyte is dominant, long lived, green and independent whereas the diploid sporophyte is short lived and dependent upon the gametophyte 57 (a) Sphagnum is a bryophyte, commonly called as bogmass or peat moss. It is hygroscopic and possesses a rem arkable water holding capacity. Hence, it is used as a packing material in the transportation of flowers, live plants, tubers, bulbs, seedlings, etc. It is also used in seed-beds and in moss-sticks 58 (b) A-Fucus, B-Polysiphonia, C-Porphyra, D-Dictyota 59 (a) The major difference between angiosperms and gymnosperms is found on the seed. This is where angiosperm seeds are coated with in the fruits. While on the other hand, gymnosperm seeds are exposed P a g e 10