A 20 volts A.C. is applied to a circuit consisting of a resistance and a coil with negligible resistance. If the voltage across the resistance is 12 V, the voltage across the coil is
Fraunhofer spectrum is a
A photon of energy 4 eV is incident on a metal surface whose work function is 2 eV. Minimum value of reverse potential to be applied for stopping the emission of electrons is
A body of mass 5 kg is moving in a circle of radius 1 m with an angular velocity of 2 radian/s. The centripetal force is
A proton and an α - particle enter into a region of uniform electric field. The ratio of the force on proton to that on α - particle is
The masses of three wires of copper are in ratio 1 : 2 : 3 and their length are in the ratio 3 : 2 : 1. The ratio of their resistances is
Three identical cells each of e.m.f. 2 V and unknown internal resistances are connected in parallel. This combination is connected to a 5 Ω resistor. If the terminal voltage across the cell is 1.5 V, then internal resistance of each cell is
During X-ray formation if voltage is increased
The de-Broglie wavelength of a particle moving with a velocity 2.25 x 108 ms−1 is equal to the wavelength of a photon. The ratio of kinetic energy of the particle to the energy of the photon is [velocity of light = 3 x 108 ms−1 is]
From Compton effect
λ = h/p = c/v [From de-Broglie wavelength
An electron of mass m when accelerated through a potential difference V has de Broglie wavelength λ. The de Broglie wavelength associated with a proton of mass M accelerated through the same potential difference will be
de-Broglie hypothesis treated electrons as
The de Broglie hypothesis states that particles of matter can behave as both waves and particles, just like light.
The fact that radiosignals reach the earth from outside the atmosphere, was discovered accidently by
Maxwell's equation describe the fundamental laws of
The capacitor of a parallel plate capacitor with no dielectric substance and a separation of 0.4 cm is 2 μF. The separation is reduced to half and it is filled with a substance of dielectric value 2.8. The new capacity of the capacitor is
The effective value of a.c. in a circuit is 10 A. The peak value of current is
The weight of a body is defined as
On a cold morning, a metal surface will feel colder to touch than a wooden surface because
A capacitor of capacitance 1 μF is charged to 1KV. The energy stored in the capacitor in joules is
C = 1μF
V = 1KV
energy stored U = 1/2 (CV2)
= 1/2 x 1 x 12 = 0.5
A gas at 27°C temperature and 30 atmospheric pressure is allowed to expand to the atmospheric pressure. If the volume becomes 10 times its initial volume, then the final temperature becomes
A circular coli carrying current i is placed in the earth's magnetic field such that its magnetic dipole moment is pointing towards north-west. The neutral points are located on a line passing through the centre of the coli and pointing towards
Two steel balls, one which weighs twice as much as the other, roll off a horizontal table with the same speeds. In this situation,
When a current flows in a wire, there exists an electric field in the direction of
If pressure inside two soap bubbles are 1.01 and 1.02 atm respectively, then the ratio between their volumes is (Take atmospheric pressure = 1 atm)
A magnetised wire of magnetic moment M is bent into an arc of a circle that subtend and an angle of 60° at the centre. The equivalent magnetic moment is
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:
Which is not electromagnetic wave in the following?
The ratio of kinetic energy at mean position to the potential energy when the displacement is half of the amplitude is
Light appears to travel in a straight line, because
A luminous object is placed at a distance of 30 cm from the convex lens of focal length 20 cm. On the other side of the lens, at what distance from the lens a convex mirror of radius of curvature 10 cm be placed in order to have an inverted image of the object coincident with it ?
In order to obtain image coincident with object, the image of object after refraction from the convex lens must be formed on the center of curvature of the convex mirror.
Distance of image from convex lens after refraction from it can be found by using lens equation:
⇒ v = 60cm
Thus, image is formed at a distance of 60cm from the lens.
Thus, the convex mirror should be kept at distance 60cm−10cm=50cm from the lens such that the image is formed at its center of curvature.
When sand is poured on a rotating disc, its angular velocity will
The radius of gyration of a uniform rod of length L about on axis passing through its centre of mass is
A P-type semiconductor can be obtained by adding
The dominant mechanisms for motion of charge carriers in forward and reverse biased silicon P-N junctions are
In charging a battery of motor-car, the following effect of electric current is used
Two simple pendulums of length 16l and l are in the phase at the mean position at a certain time. If T is the time period of shorter pendulum, the minimum time after which they will be again in phase is
The pendulum having greater time period makes one oscillation less than the other
Two moles of monoatomic ideal gas at 60°C are mixed adiabatically with one mole of another monoatomic ideal gas at 12°C. The final temperature of the mixture is
In a process, 110 J of heat is added to a gaseous system. If it increases the internal energy of the system by 40 J, then the amount of external work done is
The physical quantities not having same dimensions are
A tuning fork whose frequency as given by manufacturer is 512 Hz is being tested with an accurate oscillator. It is found that the fork produces a beat of 2 Hz when oscillator reads 514 Hz but produces a beat of 6 Hz when oscillator reads 510 Hz. The actual frequency of fork is
The equation of progressive wave is y = 0.2 sin 2π [t/0.01 - x/0.3], where x and y are in metre and t is in second. The velocity of propagation of the wave is
At high altitude, a body explodes at rest into two equal fragments with one fragment receiving horizontal velocity of 10 m/s. Time taken by the two radius vectors connecting point of explosion to fragment to make 90° is (g = 10 m/s2)
A shell is fired from a cannon with a velocity νm/s at an angle θ with the horizontal direction. At the highest point in its path, it explodes into 2 pieces of equal masses. One of the pieces retraces its path to the cannon. The speed in m/s of the other piece immediately after the explosion is
A body of mass 40 kg having velocity 4 m/s collides with another body of mass 60 kg having velocity 2 m/s. If the collision is inelastic, then loss in kinetic energy will be
ss of first body m1=40 kg and its velocity u1=4 m/s
Mass of second body m2=60 kg and its velocity u2=2 m/s
Energy lost in perfectly inelastic collision
Two wires of same radius and length are subjected to the same load. One wire is of steel and the other is of copper. If Young's modulus of steel is twice that of copper, then ratio of elastic potential energies stored per unit volume in steel wire to that in copper wire is
Reaction of tert-butyl bromide with sodium methoxide produces
The products obtained via oxymercuration (HgSO₄ + H₂SO₄) of 1-butyne would be
The ratio of specific charge of a proton to an α-particle is
e/m "for proton" =1/1 ,
e/m "for alpha-"particle" = 2/4 =1/2
A photon of wavelength 4000 Å strikes a metal surface, the work function of the metal being 2.13 eV. The kinetic energy of the emitted photolectron is __
Energy of phtoon,
Haloalkane in the presence of alcoholic KOH undergoes
Elimination of bromine from 2- bromobutane results in the formation of
Dimerisation in carboxylic acid is due to
Scurvy is caused due to deficiency of
The correct order of hybridisation of the central room atom in the following species, NH₃, [PtCl₄]2⁻, PCl₅ and BCl₃ is respectively
Which of the following species has linear shape?
A chemical reaction will be spontaneous if it is accompained by a decrease of
If a reaction involves only solids and liquids, Which of the following is true ?
When pressure is applied to the equilibrium system, the ice ⇌ water.
By increase in temperature in exothermic reactions equilibrium constant will decrease.
Which one of the following statements about the order of a reaction is true?
In the complete combustion of butanol (C4H9OH(l))
The molar heat capacity of water at constant pressure is 75 J-K⁻1-mol⁻1. When 1.0 KJ of heat is supplied to 100 g of water, then increase in the temperature of water is
A good example of an auxin herbicide is
The coordination number of Fe(II) in oxyhaemoglobin is
The compound without a chiral atom is
Two electrolytic cells, one containing acidified ferrous chloride and another acidified ferric chloride, are connected in series. The ratio of iron deposited at cathodes in the two cells will be
Standard electrode potentials are
Fe2⁺/Fe (E° = -0.44 V)
Fe3⁺/Fe2⁺ (E° = - 0.77 V)
Fe2⁺,Fe3⁺ and Fe blocks are kept together,then
The conductance of electrolytes increases with
When K2O is added to water, the solution is basic because it contains a significant concentration of
Beryl is an important mineral of
The compressibility factor of an ideal gas is
In which of the following pairs, both the complexes show optical isomerism?
A closed flask contains water in all its three states, solid, liquid and vapour at 0°C. In this situation the average kinetic energy of water molecules will be
The average kinetic energy is maximum in the gaseous state
The structure and hybridization of Si(CH₃)₄ is
The electronegativity follows the order
The pH of pure water is
The pair of amphoteric hydroxide is
Acetamide and ethylamine can be distinguished by reacting with
Which of the following is an example of natural polymer?
In Carius tube the compound ClCH₂-COOH was heated with fuming HNO₃ and AgNO₃. After filtration and washing, a white ppt. was formed. The ppt. is
Following carbocation changes to more stable carbocation :
Increasing order of the following alkyl halides for SN1 reaction is
In the reaction 4Fe + 3O₂ → 4Fe3⁺ + 6O₂- which of the following statement is incorrect ?
During Lassaigne's test, N and S present in an organic compound changes into
Molarity of HCl (ℓ) if its density is 1.17 g/cc
30 ml of solution is neutralised by 15 ml of 0.2 N base. The strength of the acid solution is
The volume of 0.025 M H3PO4 required to neutralise 25 ml of 0.03 M Ca(OH)2 is
Let the volume used be v
thus 3 x v x 0.025 = 25 x 2 x 0.03 ⇒ v = 20 ml
In Kjeldahl's method, CuSO₄ acts as
The number of unpaired electrons in ferrous ion is
Ring test for nitrate is performed by adding freshly prepared FeSO₄ solution and conc. H₂SO₄. The brown ring in this test is due to
Which one causes water bloom?
Except mammals, the lungs occur in
In a dorsiventral leaf, protoxylem and metaxylem are located respectively
Protonema is found in the life cycle of
What is the characteristic branching pattern of Riccia thallus
DNA synthesis occurs during
If mitotic division is restricted in G₁ phase of cell, the condition is known as
Peritrichous bacteria have flagella
A prokaryotic cell lacks
Haploid chromosome number is 12. What is the number in a monosomic?
Which is correct match
Which of the following indicates a normal white blood cell count?
The liquid portion of blood is referred to as _____.
Which of the following might trigger erythropoiesis?
Preventive birth control measure is :
Amniocentesis is a method to :
1. Detect genetic disorders in an unborn baby.
2. Prenatal sex determination.
3. Medical termination of pregnancy.
4. Fertilize the egg.
Which of the following are liver waste products?
The percentage of ratio of natality over mortality is called :
Biome with broad-leaved resinous fire resistant drought enduring plants is
A working combination of an apoenzyme and a coenzyme is termed as
If a person is passing out large amount of urine and feeling thirsty, yet his urine has no glucose, then the cause of copious micturition can be
Hormone connected with concentration of urine or reabsorption of water by nephron is
Enzymes occur in animal body
The most significant character of a man from the evolution point of view is
Cycas is similar to angiosperms in having
Which of these is correct statement ?
The term "gymnosperm" comes from the composite word in Greek: γυμνόσπερμος (γυμνός, gymnos, 'naked' and σπέρμα, sperma, 'seed'), literally meaning "naked seeds". The name is based on the unenclosed condition of their seeds (called ovules in their unfertilized state).
Hence, Option D
In Lathyrus odoratus, the cross between two purple flowered plants gave a pink flowered progeny. This is due to
A heterozygous round seeded plant(Rr) plant is crossed to recessive wrinkled(rr) seeded plant.The progeny would be :
The phenomenon where the offspring superior than either of the parents is :
Where the optic nerve leaves the eye, the retina has no rods and cones and the images falling in this area cannot be perceived. This area is referred to as the
A noninfectious unnatural and unusual reaction to a substance or condition is
Blood group A has
Antibody is connected with
AIDS spreads through
Mammary glands are modified
Which is common among fly, mosquito and cockroach?
Claviceps purpurea is casual organism of
Peptidoglycan is characteristic constituent of cell wall in
A Dutch scientist A.V. Leeuwenhoek discovered bacteria for the first time in
Unsaturated fats are made saturated by
Compensation point refers to
Mg and Fe are needed for plants in
Frame work elements in plants are
Wings of cockroach arise from
In the gizzard of cockroach, the food is
Testes of Earthworm occur segments
Blood vascular system of earthworm is
Bicollateral condition is found in
The plant, which bears clinging roots is
In Opuntia the stem is
A phylloclade is a flattened stem with multiple internodes and nodes that serve as a leaf. It arise in the axil of the leaf, does not have any axillary bud but shows unlimited growth. The spines on its surface represent the modified leaves of the axillary bud which serve to check the rate of transpiration and also protect the plant from herbivores. In Opuntia, leaves are reduced to spines and stem is modified to perform photosynthesis.
Thus, the correct answer is option C.
Sensory receptors initiate nerve impulses in
Humus is good for plant growth because
Shallow lakes with abundant organic matter are
Ventrally placed gill slits are characteristic of
The fermentation in yeast is
Organic farming is raising crops through use of
Pasteurisation is a process that is undertaken to
Biogas is produced by anaerobic fermentation of dung and other forms of plant and animal wastes. It consists of
Which one of the following is useful in Rice fields?
Agar is obtained from
Large number of bacteria produced from a single bacterium is called
Plants developed in vitro culture from pollen grains are
In sclerenchyma, wall is
Sexual dimorphism is distinct in Ascaris because of
Ultra-violet light causes
Lichens do not occur in areas with
An air pollutant which can cause acid rain and which is injurious to respiratory tissue is
What does the following sequence represent?
Blue-Green Algae → Crustose Lichens → Foliose Lichens → Mosses → Shrubs → Dicotyledonous trees
The organisms inhabiting a common environment belong to the same
Insulin produced by β-cells in our body contains amino acids
The plants differentiated from pollen grain grown in vitro condition are called
The normal or polygonum type embryo sac is
Chalazogamy occurs in
Anemophillous flowers have
Antrum is filled with fluid and is found in
Which of the following would be affected by removal of the prostate gland?
Which of the following hormones is controlled by positive feedback?
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
Pulses belongs mostly to -
A crop plant that can grow well is nitrogen deficient soils without addition of manure is -
Which of the following is not a characteristic of the glomerulus?
Pressure filtration occurs at the
Decreasing the concentration of sodium ions in the blood will result in
Types of food chains are
The _____ nervous system division usually stimulates and promotes digestion.