Which of the following can be used as the halide component for Friedel Crafts reaction?
Chlorobenzene
Bromobenzene
Chloroethene
Isopropyl chloride
Consider the junction diode as ideal. The value of current flowing through AB is:
0 A
10-2 A
10-1 A
10-3 A
What is the minimum velocity with which a body of mass m must enter a vertical loop of radius R so that it can complete the loop?
Which of the following statements are correct?
(a) Centre of mass of a body always coincides with the centre of gravity of the body.
(b) Centre of mass of a body is the point at which the total gravitational torque on the body is zero.
(c) A couple on a body produce both translational and rotational motion in a body.
(d) Mechanical advantage greater than one means that small effort can be used to lift a large load.
(b) and (d)
(a) and (b)
(b) and (c)
(c) and (d)
Which of the following cell organelles is responsible for extracting energy from carbohydrates to form ATP?
Lysosome
Ribosome
Chloroplast
Mitochondrion
Which of the following has the longest C-O bond length? Free C-O bond length in CO is .
Ni(CO)4
[Fe(CO)4]2-
[Mn(CO)6]+
What is the function of germ pore?
Absorption of water for seed germination
Intiation of pollen tube
Release of male gametes
Emergence of radical
In gobar gas, the maximum amount is that of:
Methane
Propane
Carbon dioxide
Butane
In an ammeter 0.2% of main current passes through the galvanometer. If resistance of galvanometer is G, the resistance of ammeter will be:
The sum of coordination number and oxidation number of the metal M in the complex [M(en)2 (C2O4)]Cl (where en is ethylenediamine) is:
9
6
7
8
If is the force acting on a particle having position vector and be the torque of this force about the origin, then:
Which one of the following equations of motion represents simple harmonic motion?
Where k, k0, k1 and a are all positive.
acceleration = - k(x + a)
acceleration = k(x + a)
acceleration = kx
acceleration = -k0x+k1x2
Aerobic respiratory pathway is appropriately termed:
Parabolic
Amphibolic
Anabolic
Catabolic
In the reaction . The rate of appearance of bromine (Br2) is related to rate of disappearance of bromide ions as following:
Predict the product:
peripatus is a connection link between:
Mollusca and Echinodermata
Annelida and Arthropoda
Coelenterata and Porifera
Ctenophora and Platyhelminthes
Which one of the following is now being commercially produced by biotechnological procedures?
Nicotine
Morphine
Quinine
Insulin
In genetic engineering, a DNA segment (gene) of interest is transferred to the host cell through a vector. Consider the following four agents (A-D) in this regard and select the correct option about which one or more of these can be used as a
vector/vectors
Statements
(A) A bacterium
(B) Plasmid
(C) Plasmodium
(D) Bacteriophage
Options:
(A), (B) and (D) only
(A) only
(A) and (C) only
(B) and (D) only
Select the correct combination of the statements (a-d) regarding the characteristics of certain organisms
(a) Methanogens are Archaebacteria which produce methane in marshy areas
(b) Nostoc is a filamentous blue-green alga which fixes atmospheric nitrogen
(c) Chemosynthetic autotrophic bacteria synthesize cellulose from glucose
(d) Mycoplasma lack a cell wall and can survive without oxygen
The correct statements are
(b), (c)
(a), (b), (c)
(b), (c), (d)
(a), (b), (d)
In which of the following molecules the central atom does not have sp3 hybridization?
CH4
SF4
A particle moves a distance x in time t according to equation x = (t + 5)-1. The acceleration of particle is proportional to
(Velocity)2/3
(Velocity)3/2
(Distance)2
(Distance)-2
Which one of the following statements about all the four of Spongilla, Leech, Dolphin and Penguin is correct?
All are bilaterally symmetrical
Penguin is homoiothermic while the remaining three are poikilothermic
Leech is a fresh water form while all others are marine
Spongilla has special collared cells called choanocytes, not found in the remaining three
Select the two correct statements out of the four (a-d) given below about lac operon.
The correct statements are
(a) and (b)
(b) and (c)
(a) and (c)
(b) and (d)
The technical term used for the androecium in a flower of China rose (Hibiscus rosasinensis) is
Polyadelphous
Monadelphous
Diadelphous
Polyandrous