Sa Mock Xi
Sa Mock Xi
Sa Mock Xi
PHYSICS
1. If a unit vector ̂ is rotated through an angle of 45° anticlockwise, then the new vector will be:
7. A unit vector is represented as (0.8 ̂ + b ̂ + 0.4𝒌 ). Hence the value of 'b' must be
8. The sum of the numbers 436.32, 227.2, and 0.301 in appropriate significant figures is
10. The mass and volume of a body are 4.237 g and 2.5 cm3, respectively. The density of the
material of the body in correct significant figures will be
(a) 1.6048 g cm-3 (b) 1.69 g cm-3 (c) 1.7 g cm-3 (d) 1.695 g cm-3
11. The periods of oscillation of a simple pendulum in an experiment are recorded as 2.63 s, 2.56 s,
2.42 s, 2.71 s and 2.80 s respectively. The average absolute error will be:
13. If the error in the measurement of the radius of a sphere is 2%, then the error in the
determination of the volume of the sphere will be
14. If force (F), velocity (v) and time (T) are taken as fundamental units, the dimensions of mass
will be
(a) [LT-2] , [L] ,[T] (b) [L2] , [T] and [LT2] (c) [LT2], [LT] and [L] (d) [L], [LT] and [T2]
18. If the vectors𝑨⃗ =2 ̂+4 ̂ and 𝑩⃗ =5 ̂ – p ̂ are parallel • to each other, the magnitude of 𝑩⃗ is
21. Two forces in the ratio 1 : 2 act simultaneously on a particle. The resultant of these forces is
three times the first force. The angle between them is
22. . Two equal forces are acting at a point with an angle of 60° between them. If the resultant
force is equal to 40√𝟑 N the magnitude of each force is
𝜶𝒛
𝜶
24. In the relation p =𝜷 𝒆 𝒌𝜽 , p is pressure, z is distance, k is Boltzman
Boltzmannn constant and 𝜽 is the
temperature.
e. The dimensional formula of 𝜷 will be
(a) [M°L2 T1] (b) [ML°T-1] (c) [ML2T] (d) [M°L2 T-1]
(a) [ML-1 T-1] (b) [MLT-2] (c) [ML° T-2] (d) [MLT-1]
CHEMISTRY
26. 1L = ______ dm3
35. An oxide of nitrogen contains 36.8% by weight of nitrogen. The formula of the
compound is –
(a) N2O (b) N2O3 (c) NO (d) NO2
38. 46.
39.
47.
40.
48.
41. 49.
50.
42.
43.
44.
BIOLOGY
51. Select the incorrect statement from the following :
2) Plant families like convolvulaceae and solanaceae are included in other polynomials
mainly based on floral characters
3) All living organisms – present, past and future are linked to one another by sharing of
common genetic material but to varying degrees
4) Order solanum, datura and petunia are placed in the family solanaceae
(a) Mangiferaindica (b) Solanum tuberosum (c) Solanum melongena (d) Pantheraleo
(a) the ranks of species and genus (b) the species epithet only
(c) the ranks upto phylum (d) any rank of taxonomic Hierarchy
(c) taxonomic keys are tools that help in identification based on characteristics
56. Which of the following is incorrect about the taxonomical aid keys?
(a) used for identification of plants and animals based on similarities and dissimilarities
(b) each statement in the key is called a lead (c) keys are generally analytical in nature
(d) used for identification of plants and animals based on similarities only
57. Which of the following is a false statement?
(c) potato and brinjal are two different species but they belong to the genus solanum
60. The bacteria that can survive in extreme salty areas are called
(a) thermophiles (b) methanogens (c) eubacteria (d) halophiles
61. Statement 1: Linnaeus classified plants into trees, shrubs, and herbs, on the basis of
morphological characters.
Statement 2: Aristotle divided animals into 2 groups – Anaima and Enaima.
(a) Only statement 1 is correct
(b) Only statement 2 is correct
(c) Both statement 1 and statement 2 are correct
(d) Both statement 1 and statement 2 are incorrect.
63. The bacterial cell divides every one minute. It takes 15 minutes for a cup to be one-
fourth full. How much time will it take to fill the cup?
(a) 30 minutes (b) 45 minutes (c) 60 minutes (d) 17 minutes
65. Seawater glows during the night mainly due to the occurrence of
(a) Gonyaulax (b) Noctiluca (c) Euglena (d) Cyclotella
67. Read the following statements (1-5) and answer the question which follows them.
72.Fucoxanthin is found in
(a) red algae (b) brown algae (c) green algae (d) blue-green algae