10 times nearer
20 times taller
20 times nearer
10 times taller
A thin circular ring of mass M and radius R is rotating in a horizontal plane about an axis vertical to its plane with a constant angular velocity . If two objects each of mass m be attached gently to the opposite ends of a diameter of the ring, the ring will then rotate with an angular velocity:
Two identical bodies are made of a material for which the heat capacity increases with temperature. One of these is at C, while the other one is at. C. lf the two bodies are brought into contact, then, assuming no heat loss, the final common temperature is
C
more than C
less than C but greater than C
C
One mole of an ideal monoatomic gas undergoes a process described by the equation . The heat capacity (in terms of R) of the gas during this process is
1.5
2.5
2
1
Two spheres A and B of masses m1 and m2 respectively collide. A is at rest initially and B is moving with velocity v along x-axis. After collision B has a velocity v/2 in a direction perpendicular to the original direction. The mass A moves after collision in the direction:
same as that of B
Opposite to that of B
tan-1(1/2) to the x-axis
to the x-axis
Even in absence of pollinating agents seed setting is assured in
Commellina
Zostera
Salvia
Fig
In the extraction of copper from its sulphide ore, the metal is finally obtained by the reduction of cuprous oxide with :
Copper (I) sulphide (Cu2S)
Sulphur dioxide (SO2)
Iron sulphide (FeS)
Carbon monoxide (CO)
A system consists of three masses m1, m2 and m3 connected by a string passing over a pulley P. The mass m1 hangs freely and m2 and m3 are on a rough horizontal table (the coefficient of friction=). The pulley is frictionless and of negligible mass. The downward acceleration of mass m1 is: (Assume m1=m2=m3=m)
A radiation of energy 'E' falls normally on a perfectly reflecting surface. The momentum transferred to the surface is (C = Velocity of light):
A device that converts energy of combustion of fuels like hydrogen and methane, directly into electrical energy is known as:
Dynamo
Ni-Cd cell
Fuel Cell
Electrolytic Cell
Metagenesis refers to :
Alternation of generation between asexual and sexual phases of an organism
Occurrcnce of a drastic change in form during post-embryonic development
Presence of a segmented body and parthenogenetic mode of reproduction
Presence of d different morphic forms
The following reaction
is known by the name:
Friedel-Craft's reaction
Perkin's reaction
Acetylation reaction
Schotten-Baumann reaction
An explosion blows a rock into three parts. Two parts go off at right angles to each other. These two are, 1 kg first part moving with a velocity of 12 ms-1 and 2 kg second part moving with a velocity of 8 ms-1. If the third part flies off with a velocity of 4 ms-1, its mass would be:
7 kg
17 kg
3 kg
5 kg
What will happen if the stretch receptors of the urinary bladder wall are totally removed ?
Micturition will continue
Urine will continue to collect normally in the bladder
There will be no micturition
Urine will not collect in the bladder
Cyclic photophosphorylation results in the formation of
ATP and NADPH
ATP, NADPH and O2
ATP
NADPH
Which one of the following types of organisms occupy more than one trophic level in a pond ecosystem ?
Fish
Zooplankton
Frog
Phytoplankton
Which of the following compounds will exhibit cis-trans (geometrical) isomerism?
Butanol
2-Butyne
2-Butenol
2-Butene
on heating with periodic acid gives:
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The most apparent change during the evolutionary history of Homo sapiens is traced in
Loss of body hair
Walking upright
Shortening of the jaws
Remarkable increase in the brain size
Vegetative propagation in Pistia occurs by
Stolon
Offset
Runner
Sucker
Which of the following species is not electrophilic in nature?
Which one is most reactive towards electrophilic reagent?
Single-celled eukaryotes are included in
Monera
Protista
Fungi
Archaea
The chief water conducting elements of xylem in gymnosperms are:
Tracheids
Vessels
Fibers
Transfusion tissue
Sertoli cells are found in
Pancreas and secrete cholecystokinin
Ovaries and secrete progesterone
Adrenal cortex and secrete adrenaline
Seminiferous tubules and provide nutrition to germ cells