Hollow trunks in trees lead to
The coordinating structure responsible for an intrinsic heart beat is the
Colleterial glands are found in
Which one is essential for nitrogen fixation ?
The controlling centre of cell is
Cristae occur in
Protoplast does not include
When a natural predator (living being) is applied on some other organism to control them, this process is called
Fossil reptile having mammalian traits was
Frog feeding on herbivorous insect is
Continental drift explains
Birds and mammals evolved during
What does lac refer to in lac operon?
Golden rice is a transgenic crop of the future, with which of the following improved trait ?
tRNA has two unequal free arms
A gamete normally contains :
How many different types of gametes can be formed by F1 progeny resulting from the following cross?
AABBCC x aabbcc
Autosomal recessive traits are
In sex-linked traits the males are
Hepatitis-B vaccine is
Who discovered vaccine against small pox?
What is true about T-lymphocytes in mammals?
Monocot stems differ from dicot stems in that
In Strychnos, strips of new cambia arise from
The process in which water is split during photosynthesis is
Azolla possesses symbiotic associtation with
Which one of the following substances plays an important role in biochemical defence of host plants?
Senescence and death are essential in the functioning of
Escherichia coli is used as an indicator organism to determine pollution of water with
Treatment of polluted water is carried out with the help of
The first nuclear explosion was conducted by
The parasite of endothelial system in man is :
Cryptorchidism is a condition in which testes are
Cryptorchidism is a congenital disorder when one or both of a newborn's testicles fail to descend into the scrotum. Although this condition may occur on both sides, it more commonly affects the right testis. Because the testicles normally descend into the scrotum during the eighth month of gestation, undescended testicles most commonly affect newborns
Unicellular eukaryotes are
Lamarck's theory of evolution is known as
Theory of Natural selection dwells on
Naturalist who sailed round the world in ship Beagle was
Which of the following symptoms might be an indication of kidney failure?
Which substance would normally be found in higher concentration in urine than in blood?
The ratio of peak value and r.m.s. value of an alternating current is
The ratio of the energy of an X - ray photon of wavelength 1 Å to that of visible light of wave length 500 Å is
The force experienced by the cathode rays when they pass through an electric field of intensity E → is
The resistance of a cell does not depend upon
A battery has e.m.f. 4V and internal resistance r. When this battery is connected to an external resistance of 2 ohms, a current of 1 amp. flows in the circuit. How much current will flow if the terminals of the battery are connected directly
If there are n capacitors in parallel connected to V volt source, then energy stored is equal to
Since the capacitors are connected in parallel to the battery, potential difference across each capacitor will be V. Hence, the total energy stored will be n times the energy stored in a single capacitor.
∴ U = n x 1/2 CV2 = 1/2 n C V2
If sky wave with a frequency of 50 MHz is incident on D-region at an angle of 300, then angle of refraction is
Two resistors are connected (a) in series (b) in parallel. The equivalent resistance in the two cases are 9 ohm and 2 ohm respectively. Then the resistances of the component resistors are
Two wires of the same material are given. The first wire is twice as long as the second and has twice the diameter of the second. The resistance of the first will be
A 50 ohm galvanometer gets full scale deflection when a current of 0.01 A passes through the coil. When it is converted to a 10 A ammeter, the shunt resistance is
Mass of a photon of frequency (v) is given by
The working of a dynamo is based on principle of
A loop of area 0.1 m2 rotates with a speed of 60 rps perpendicualr to a magnetic field of 0.4 T. If there are 100 turns in the loop, maximum voltage induced in the loop is
The current in a choke changes from 0 to 10 A in 5 seconds. If the inductance of the choke is 2H the induced emf is
The difference between soft and hard X-rays is
If the electric flux entering and leaving an enclosed surface respectively is φ₁ and φ₂, the electric charge inside the surface will be
Potential energy of two equal positive charges 1 μ C each held 1 m apart in air is
On moving a charge of 20 C by 2 cm, 2 joule of work is done, then the potential difference between the points is
W = QV
∴ V = W/Q = 2/20 = 0.1 volt
The electric field inside a sphere which carries a charge density proportional to the distance from the origin ρ = α r α is a constant is
A spherical conductor of radius R, placed in air, is given a charge Q and potential at the surface of conductor is V. The potential at a point inside the conductor and at a distance R/2 from its centre is
Three capacitors of capacitance 3 μF, 10 μF, and 15 μF are connected in series to a source of voltage 100 V. The charge on 15 μF capacitor is
The magnetic dipole moment of a current loop is independent of
In a Rutherford scattering experiment when a projectile of charge z1 and mass M1 approaches a target nucleus of charge z2 and mass M2, the distance of closest approach is r0. The energy of the projectile is:
The number of neutrons in a chain reaction increases in
A radio active sample has a half life of 5 days. To decay from 8 micro curies to 1 micro-curie, the number of days taken will be
The electrons are emitted in the photoelectric effect from a metal surface
Light of wavelength λ falls on a metal having work function hc /λ0 . Photoelectric effect will take place only if
A ray of light of frequency ν in air enters into glass of refractive index μ. The correct statement is
A plano convex lens is made refractive index 1.6. The radius of curvature of the curved surface is 60 cm. The focal length of the lens is
An n - type and p - silicon can be obtained by doping pure silicon with:
For obtaining ‘n’ type semi conductor V group element is doped with silicon.
For obtaining ‘p’ type semiconductor III group element is doped with silicon.
A transistor is operated in common-emitter configuration at Vc = 2 V such that a change in the base current from 100 μ A to 200 μ A produces a change in the collector current from 5 mA to 10 mA. The current gain is:
When a semiconductor is continuously heated the value of its resistance
The potential in the depletion layer is due to
The cause of the potential barrier in a p-n diode is
When germanium atoms is doped with equal no. of antimony atoms, we get a/an
The electic circuits used to get smooth d.c. output from a rectified circuit is called
When a source is linear, the wavefront is
If the ratio of intensities of two waves causing interference be 9:4, then the ratio of maximum and minimum intensities will be
A ray of light falls on a transparent glass slab of refractive index 1.62. If the reflected ray and the refracted ray are mutually perpendicular, the angle of incidence is
In a Young's double slit experiment, I1 ∕ I2 = 16 ∕ 9 . Ratio of maximum to minimum intensity is
Intensity ∝ slit width and Intensity ∝ (amplitude)2
Vinyl carbinol is
Formaldehyde reacts with NaOH(50%). Which one pair of products will be obtained?
Aldehydes and ketones do not give addition reaction with
Treatment of furfural with NaOH yields
Both methane and ethane can be prepared in one step by the reaction of
The conversion of 2, 3-dibromobutane to 2-butene with Zn is
An organic compound contains 49.3% carbon, 6.84% hydrogen and its vapour density is 73. Molecular formula of compound is
The random errors can be eliminated by
ACTH is secreted by
Which of the following is a test for proteins?
In both DNA and RNA, heterocylic base and phosphate ester linkages are at
Saponification of ethyl benzoate with caustic soda as alkali, gives
What is the main reason for the fact that carboxylic acids can undergo ionization?
Which of the following does give violet colour with neutral ferric chloride?
The equilibrium constant in a reversible chemical reaction at a given temperature
Which of the following is not correct?
A heat engine absorbs heat Q1 at temperature T1 and heat Q2 at temperature T2. Work done by the engine is (Q1 + Q2). This data
It does not go against first law of thermodynamics .
However it violates the 2nd law of thermodynamics.
If a mixture containing 3 moles of hydrogen and 1 mole of nitrogen is converted completely into ammonia, the ratio of volumes of reactants and products at the same temperature and pressure would be
3H2 + N2 → 2NH3
∴ 3V 1V → 2V
Total initial volume = 3V + 1V = 4V
Final volume = 2V
Hence, ratio of initial and final volume will be 2 : 1
Identify the correct statement regarding entropy
A drug that is antipyretic as well as analgesic is
The co-ordination no. of the central metal atom, in a complex compound is determined by the no. of ligands around the metal ion is bonded
The IUPAC name for CH₃CO-CH₃ is
The hybridisation state of Fe in [Fe(CN)₆]3- and [Fe(H₂O)₆]3+ is
Which of the following compound results into benzene nitrile on its dehydration?
At STP,1.12 litre of H₂ is obtained on flowing a current for 965 seconds in a solution.The value of current is
Which one of the following is not the correct reaction of aryl diazonium salts?
In which of the following reaction, hydrogen is acting as an oxidising agent?
Roasting of an ore is done in
In an experiment set up for the measurement of e.m.f. of a half-cell using a reference electrode and a salt bridge, when the salt bridge is removed the voltage
Heating of methyl phenyl ether with HI gives
If the weight of 5.6 liters of a gas at N.T.P. is 11 gram. The gas may be
Percentage of lead in lead pencil is
Arrange the following in order of increasing acidity
H₃PO₄, H₂CO₃, HCl, HI
The boiling points of the following hydrides follow the order
Which of the following substance acts as an oxidising as well as a reducing agent ?
The interionic distance for cesium chloride cystal will be
Surface tension of lyophilic sols is
Near the top of the blast furnace used for the extraction of iron, the metal oxides are reduced to spongy iron by
Fill in the blank with appropriate word.
A crescendo of metallic thuds arose from the market, where the iron-smiths were..........the pieces of metals.
Find the synonym of RECOLLECT
Find the antonym of ALIVE
Out of the given alternatives, choose the one which can be substituted for the given capitalised word.
He cannot MAKE BOTH ENDS MEET.
Improve the sentence by choosing best alternative for capitalised part of the sentence.
Please TURN OFF the volume of the radio, so that it is not so loud.