The value of x if (i + j + k) is a unit vector is

(1) ± 3

(2) ±1/2

(3) ±1/√3

(4) ± 3

The 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 

The hybridisation of C in diamond, graphite and ethyne is in the order 

(1) sp³, sp², sp 

(2) sp², sp³ , sp 

(3) sp³, sp, sp² 

(4) sp, sp² , sp³ 

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

Which of the following is incorrect in a galvanic cell? 

(1) Reduction occurs at cathode 

(2) The electrode at which electrons are lost is called cathode 

(3) Oxidation occurs at anode 

(4) The electrode at which electrons are gained is called cathode

In plants, lateral roots arise from 

(1) endodermis 

(2) epidermis 

(3) pericycle 

(4) hypodermis

Digestion 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

The length of latus rectum of the parabola 4y² + 3x + 3y + 1 = 0 is

(1) 7 

(2) 3/4 

(3) 4/3 

(4) 12

Electrophile that participates in nitration of benzene is 

(1) NO⁺₂ 

(2) NO^–₃ 

(3) NO⁺ 

(4) NO

Three 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) R_A = R_C > R_B 

(2) R_A = R_C < R_B 

(3) R_A = R_B = R_C 

(4) R_A < R_B < R_C