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Identify the incorrect statement from the following.
(1) Response of T-cells is called cell mediated immunity
(2) B-cells produce antibody
(3) Macrophages are the phagocytic cells
(4) Interferons kill viruses
(4) Interferons kill viruses
(4) Interferons kill viruses
See lessThe number of oxygen atoms in 4.4 gm of CO2 is,
(1) 6 x 1022
(2) 12 x 1023
(3) 1.2 x 1023
(4) 6 x 1023
Correct option (1) 6 x 1022Explanation:44 g of CO2 contains 6.022 × 1023 CO2 molecules∴4.4 g of CO2 contains 6.022 × 1022 CO2 moleculesEach CO2 molecule contains two oxygen atoms ∴ 6.022 × 1022 CO2 molecules contain 1.2 × 1023 O atoms.
Correct option (1) 6 x 1022
Explanation:
44 g of CO2 contains 6.022 × 1023 CO2 molecules
∴4.4 g of CO2 contains 6.022 × 1022 CO2 molecules
Each CO2 molecule contains two oxygen atoms
∴ 6.022 × 1022 CO2 molecules contain 1.2 × 1023 O atoms.
See lessTwo dice are thrown simultaneously, the probability of obtaining a total score of 5 is
(1) 1/12
(2) 1/6
(3) 1/18
(4) 1/9
Correct option (4) 1/9Explanation:n(S) = 36Favourable outcomes : (1, 4), (4, 1), (3, 2), (2, 3)Required probability 4/36 = 1/9.
Correct option (4) 1/9
Explanation:
n(S) = 36
Favourable outcomes : (1, 4), (4, 1), (3, 2), (2, 3)
Required probability 4/36 = 1/9.
See lessWhat is the role of competitive inhibitor during enzyme action?
(1) It alters the active site of the enzyme and prevents the binding of substrate
(2) It enhances enzyme action
(3) It inhibits breaking of chemical bonds of the substrate
(4) It declines the enzyme action
(4) It declines the enzyme action
(4) It declines the enzyme action
See lessThe value of tan π/8 is equal to
(1) √2 + 1
(2) 1-√2
(3) 1/2
(4) 1/√2+1
Correct option (4) 1/√2 +1Explanation:tan π/8 = √2 -1 = 1/√2 +1
Correct option (4) 1/√2 +1
Explanation:
tan π/8 = √2 -1 = 1/√2 +1
See lessDigestion of proteins is incomplete in the absence of enterokinase, because
(1) Trypsinogen is not converted into trypsin
(2) Pepsinogen is not converted into pepsin
(3) Prorennin is not converted into rennin
(4) Chymotrypsinogen is not converted into chymotrypsin
(1) Trypsinogen is not converted into trypsin
(1) Trypsinogen is not converted into trypsin
See lessThe property which is not true about Fluorine is,
(1) It forms only one oxo acid
(2) High F-F bond dissociation enthalpy
(3) Most of its reactions are exothermic
(4) Highest electronegativity
Correct option (2) High F-F bond dissociation enthalpy Explanation:F2 has low bond dissociation enthalpy due to small size and repulsion due lone pair electrons.
Correct option (2) High F-F bond dissociation enthalpy
Explanation:
F2 has low bond dissociation enthalpy due to small size and repulsion due lone pair electrons.
See lessThree projectiles A, B and C are projected at an angle of 30°, 45°, 60° respectively. If RA, RB and RC are ranges of A, B and C respectively, then (velocity of projection is same for A, B and C)
(1) RA = RC > RB
(2) RA = RC < RB
(3) RA = RB = RC
(4) RA < RB < RC
Correct option (2) RA = RC < RBExplanation:Range is maximum for 45°∴ B has maximum rangeRange is same for both 30° and 60° as they are complementary angles.∴ RA = RC < RB
Correct option (2) RA = RC < RB
Explanation:
Range is maximum for 45°
∴ B has maximum range
Range is same for both 30° and 60° as they are complementary angles.
∴ RA = RC < RB
See lessA person who has allergy, the type of antibody produced in his body is
(1) IgE
(2) IgA
(3) 1gM
(4) IgG
The Correct option is (1) IgE
The Correct option is (1) IgE
See lessFind the sequence of binding of the following aminoacyl t-RNA complexes during translation to m-RNA transcribed by a DNA segment having the base sequences 3’TACATGGGTCCG5′.
Choose the answer showing the correct order of alphabets.
(1) C, D, B, A
(2) A, B, D, C
(3) D, C, A, B
(4) B, A, D, C
(4) B, A, D, C
(4) B, A, D, C
See less