The quality factor Q of LCR circuit having resistance (R) and inductance (L) at resonant frequency ω is given by
Among the following four spectral regions, the photon has the highest energy in
A wire of resistance R is divided in 10 equal parts. These parts are connected in parallel, the equivalent resistance of such connection will be
A mass of 2 kg is whirled in a horizontal circle by means of a string at an initial speed of 5 revolutions per minute. Keeping the radius constant the tension in the string is doubled. The new speed is nearly
A resistor of 0.5 Ω is connected to another resistor in parallel combination to get an equivalent resistance of 0.1 Ω. The resistance of second resistor is
Two condensers, one of capacity C and the other of capacity C/2 , are connected to a V volt battery, as shown.
The work done in charging fully both the condensers is
The north pole of a long horizontal bar magnet is being brought closer to a vertical conducting plane, along the perpendicular direction. The induced current in the conducting plane is
As per Lenz's law, induced current must be anticlockwise, so as to develop north polarity to oppose the incoming north pole.
The dimensions of RC are the same as the dimensions of L/R
The displacement current arises when electric field in a region
Three capacitors of capacitances 2 μF, 4 μF and 6 μF are connected in a parallel combination. Their equivalent capacitance will be
If a ladder weighing 250 N is placed against a smooth vertical wall having coefficient of friction between it and floor is 0.3, then what is the maximum force of friction available at the point of contact between the ladder and the floor
A body weighs 500 N on the surface of the earth. How much would it weigh half way below the surface of the earth?
The metallic bob of a simple pendulum has the relative density ρ. The time period of this pendulum is T. If the metallic bob is immersed in water, then the new time period is given by
A parallel plate air condenser has certain capacity. When 2 3 of the distance between the plates is filled with a dielectric, the capacity is found to increase by a factor of 2.25. The dielectric constant is
A partition wall has two layers A and B in contact, each made of different material. They have the same thickness but the thermal conductivity of layer A is twice that of layer B. If the steady state temperature difference across the wall is 60 K, then the corresponding difference across the layer A is
Two beams of light having intensities I and 4I interfere to produce a fringe pattern on a screen. The phase difference between the beams is π/2 at point A and π at point B. Then the difference between the resultant intencities at A and B is
Which of the following has maximum specific heat
Two circular coils of diameters 10 and 20 cm have the same no. of turns and currents. The ratio of magnetic field inductions produced at the centre of the coils, when connected in series, is
When a resistance R is connected in series with a galvanometer of resistance 100 Ω, it acts as a voltmeter of range V. to double the range, an additional resistance of 1000 Ω is to be connected is series with R. The value of R is
The magnetic field near a current carrying conductor is given by
If a diamagnetic subsatnce is brought near north or south pole of a bar magnet it is
The domain formation is a necessary feature of
If a diamagnetic substance is brought near the north or the south pole of a bar magnet, it is:
A body floats in a liquid contained in a beaker. If the whole system falls under gravity, then the upthrust on the body due to liquid is
Raindrops are falling from a certain height. Assume all raindrops are spherical and have same drag coefficient. The impact speed of large raindrops compared to that of small raindrops is
For a constant hydraulic stress on an object, the fractional change in the object's volume (Δ V/V) and its bulk modulus (K) are related as
Moment of inertia of a disc about its own axis is I. Its moment of inertia about a tangential axis in its plane is
Position of a particle moving along x axis is given by x = 3t - 4t2 + t3, where x is in mts and t in seconds. find the average velocity of the particle in the time interval from t = 2 sec to 4 sec.
A body, whose momentum is constant, must have constant
Statement-1: Energy is released when heavy nuclei undergo fission or light nuclei undergo fusion .and
Statement-II: For heavy nuclei , binding energy per nucleon increases with increasing Z while for light nuclei it decrease with increasing Z .
A man suffering from short-sight is unable to see objects distinctly at a distance more than 2 m. The power of lens required to correct this defect should be
Which of the following cannot be emitted by radioactive substances during their decay?
Stopping potential for photoelectrons
If the period of oscillation of mass (M) suspended from a spring is 2 s, then the period of mass 4 M will be
A bomber plane is moving horizontally with a speed of 500 ms-1 and a bomb released from it, strikes the ground in 10 s. The angle at which it strikes the ground is (g = 10 m/s2)
Here, νx = 500 m/s; νy = gt = 10 x 10 = 100 m/s
When the light source is kept 20 cm away from a photocell, stopping potential is 0.6 V is obtained. When the source is kept 40 cm away, the stopping potential will be
How does refractive index (μ) of a material vary with respect to wavelength (λ)? A and B are constants.
A mark at the bottom of a beaker containing liquid appears to rise by 0.1 m. The depth of the liquid is 1 m. The refractive index of liquid is
Focal length of a convex lens of refractive index 1.5 is 2 cm. Focal length of this lens when immersed in a liquid of refractive index of 1.25 will be
When a beam of light is used to determine the position of an object, the maximum accuracy is achieved if the light is
A circular disc is to be made by using iron aluminium, so that it acquires maximum moment of inertia about its geometrical axis. It can be obtained with
A body executes SHM with a period of 11/7 sec and an amplitude 0.025m. The maximum value of its acceleration is
Which of the following statement is correct?
When phosphorus and antinomy are mixed in Germanium, then
When the displacement is half of the amplitude, then what fraction of total energy of a simple harmonic oscillator is kinetic ?
The velocity of transverse wave in a 150 cm long wire of mass 5 gm subjected to a tension of 1200 N is
When a cylindrical tube is dipped vertically into a liquid, the angle of contact is 140º . When the tube is dipped with an inclination of 40º , then angle of contact is
If 96500 C of electricity liberates one gram equivalent of any substance, the time-taken for a current of 0.15 A to deposit 20 mg of copper from a solution of copper sulphate is (Chemical equivalent of copper = 32)
Electric bulb 50 W-100 V glowing at full power are to be used in parallel with battery 120 V, 10Ω. Maximum number of bulbs that can be connected so that they glow in full power is
A current i passes through a wire of length l, radius of cross-section r and density ρ. The rate of heat generation is
c.c is completely filled with mercury at 20°C. The temperature of the system is raised to 100°C. If the coefficient of linear expansion of glass is 9×10−6/°C and coefficient of absolute expansion of mercury is 1.8×10−4/°C, the volume of mercury that overflows is nearly
When the pressure on water is increased the boiling temperature of water as compared to 100ºC will be
In a reversible isochoric change
If the acceleration due to gravity is 10ms⁻2 and the units of length and time are changed in kilometer and hour respectively, the numerical value of the acceleration is
Unit of moment of inertia in MKS system
In Young's experiment of double slit, the intensity of central bright band is ---- times the individual intensities of the interfering waves
If a source of light is moving away from a stationary observer, then frequency of light wave appears to change because of
In the case of a moving source of sound approaching an observer
A 1 cm long string vibrates with fundamental frequency of 256 Hz. If the length is reduced to 1/4 cm keeping the tension unaltered, the new fundamental frequency will be
If a body of mass 3 kg is dropped from the top of a tower of height 25 m, then its kineic energy after 3 s will be
In which of the following reactions ethylene is formed?
When Cl₂ is passed through propene at 400ºC. Which of the following is major product ?
Acetylene reacts with ammonical silver nitrate to form
Azimuthal quantum number determines the
1-Butyne reacts with cold alkaline KMnO₄ to yield
Sodium borate on reaction with conc. H₂SO₄ and C₂H₅OH gives a compound A which burns with a green edged flame. The compound A is
In 14C isotope, the number of neutrons would be
No two electrons in an atom will have all the four quantum numbers same. This statement is known as
The reaction of aniline with benzaldehyde is
Carbon atoms in benzene molecule are inclined at an angle of
For melting of a solid at 25ºC ,the fusion process requires energy equivalent to 2906 Joules to be added to system considering the process to be reversible at fusion point ,the entropy change of the process is
The state of hybridisation of B in BCl₃ is
1 mole of N₂ and 2 moles of H₂ are allowed to react in a 1 dm3 vessel. At equilibrium 0.8 mole of NH₃ is formed. The concentration of H₂ in the vessel is
In gaseous reactions important for the understanding of the upper atmosphere, H2O and O react bimolecularly to form two OH radicals. ΔH for this reaction is 72 kJ at 500 K and Ea is 77 kJ mol−1 , then Ea for the bimolecular recombinations of two OH radicals to form H2O and O, is
The enthalpies of combustion of carbon and carbon monoxide are -390 kJ mol⁻1 and -278 kJ mol⁻1 respectively. The enthalpy of formation of carbon monoxide is
Heat of combustion ΔH for C(s), H2(g) and CH4(g) are -94, -68 and -213 cal/mol. Then ΔH for C(s) + 2H2(g) → CH4(g) is
CH4 + 2O2 = CO2 + 2H2O
ΔH = -213 cal/mol .....(1)
C + O2 = CO2
ΔH = - 94 cal/mol .....(2)
H2 + (1/2) O2 = H2O
ΔH = - 68 cal/mol .....(3)
ΔH for C(s) + 2H2(g) → CH4(g)
= 2(eq 3) + (eq 2) - (eq 1)
= (- 68 x 2) + (- 94) - (- 213) = -17Kcal
CH₃CH₂CH₂CH(CH = CH₂)CH₂CH₂CH₃ is
Which of the following has the highest first ionisation potential?
As we move from left to right in a period, the ionisation enthalpy increases with increases in atomic number. Secondly, P has extra-stable exaclty half-filled electronic configuration. That's why P has the highest first ionisation potential.
The electronic configuration of P:
Which of the following co-ordination compounds would exhibit optical isomerism?
Which of the following is antipyretic?
When electric current is passed through acidified water for 1930 seconds, 1120ml of H2 gas is collected (at STP) at the cathode. What is the current passed in amperes?
Zone refining process is used for the
One mole of argon gas will have least density at
A real gas most closely approaches the behaviour of an ideal gas at
In the electrolytic extraction of aluminium fused cryolite is added
Percentage of lead in lead pencil is
The most stable +2 oxidation state is exhibited by
In NH₃ and PH₃ the common is
Chemical A is used for water softening to remove temporary hardness. A reacts with sodium carbonate to generate caustic soda. When carbon dioxide is dubbled through A, it turns cloudy. What is the chemical formula of A?
Sulphuric acid reacts with PCl₅ to give
Which one of the following oxides of chlorine is obtained by passing dry chlorine over silver chlorate at 90ºC?
A variety of water which contains soluble salts of Ca and Mg is known as
The pH value of N/10 NaOH is
Which of the following is a weak electrolyte?
Which of the following will give maximum ions in solution?
Isopropyl chloride undergoes hydrolysis by
Secondary, primary allylic and primary benzylic halides may react predominantly either by SN1 or SN2 mechanism or by both the mechanisms without much preference, depending upon the nature of the nuclephile and the solvent.
Half life of a radioactive particle is 1 second. The rate of dissociation of A is 1000 per second. Then after 3 seconds, A will be
In radioactive decay which one of the following moves the fastest ?
Total number of isomeric alcohols with formula C4H10O are :
Which of the following on oxidation followed by hydrolysis gives pyruvic acid?
Conc. HNO3 forms NO+2 in presence of :
Which does not contain conjugate system?
In dienes, when the double bonds connected to each other by a single bond, this arrangement is known as conjugated.
The order of decreasing ease of reaction with ammonia is
Which of the following react with NaOH to produce an acid and an alcohol ?
Which of the following compounds shows optical isomerism?
The molecule with maximum boiling point is
The strongest acid among the following aromatic compound is
In which of the following compounds transition metal is in oxidation state zero ?
Which of the following has molecular weight of 92?
The pure crystalline substance on being heated gradually first forms a turbid liquid at constant temperature and still at higher temperature turbidity completely disappears. The behaviour is a characteristic of substance forming
Which of the following polymer is prepared from single monomer?
In the coordination compound, K₄[Ni(CN)₄], the oxidation state of nickel is
Which of the following has a plane of symmetry?
Adsorbed acetic acid on activated charcoal is
A mixture of two completely miscible non-ideal liquids which distil as such without change in its composition at a constant temperature as though it were a pure liquid. This mixture is known as
X litres of CO is present at STP. It is completely oxidised to CO2. The volume ofCO2 formed is 11.2 litres at STP. What is the value of X.
The first element in the 3d-transition series is
Azeotropic mixtures are
Transition elements are frequently used as catalysts because
The component units of compound eye of cockroach are called
During which phase of meiosis homologous chromosomes separate ?
Which of the following is a characteristic of pulmonary circulation?
The class of coelenterate which exhibits polymorphism:
What converts fibrinogen to fibrin?
Complications of aplastic anemia generally do not include:
Which one of the following is called the Indian redwood tree?
Which of the following is not a plant fibre?
What organ produces the enzyme trypsin?
Sugarcane is generally propagated vegetatively because
Lacteals primarily absorb
A good example of an auxin herbicide is
In biotic community, primary consumers are
Great Barrier Reef along east coast of Australia is a
An ecosystem has two components such as
Which of the following animal is the most economical 'Meat making machine'?
Hormones thyroxine and adrenaline and pigment melanin formed from
Azadirachtin, a common constituent of mosquito repellant coils comes from
In bacterial DNA replication, synthesis starting from the site of origin of replication
Homeostasis is the term used to describe
Which one of the following is incorrect ?
Sickle-cell anaemia is a genetic disorder. The cause of the disease is due to :
(i)The substitution of glutamic acid in place of aspartic acid.
(ii)The substitution of proline in place of methionine.
(iii) Substitution of valine in place of glutamic acid.
Select the correct answer using the codes given below :
Mendel's dihybrid cross ratio is :
Which traits of garden pea studied by Mendel was a recessive feature ?
The intensity levels of whispering noise is
Tiny free living animals on the surface of water constitute
Meningitis is a disease of
Fovea centrails of human retina is characterised by
A colour blind person can not distinguish
The pharyngeal tonsils are found in the:
Adenoids (or pharyngeal tonsils, or nasopharyngeal tonsils) are a mass of lymphoid tissue situated at the very back of the nose, in the roof of the nasopharynx, where the nose blends into the mouth
Renal portal system is present in
Minerals absorbed by roots move to the leaf through
Molluscan blood contains
ATP formation in chloroplast and mitochondrion is explained by
Chemiosmotic coupling hypothesis is the most widely accepted explanation for oxidative phosphorylation in mitochondria and photophos- phorylation in thylakoid membranes. Mitchell proposed the idea of chemiosmotic coupling.
He suggested that a concentration gradient of protons is established across the mitochondrial membrane because there is an accumulation of hydrogen ions on one side of the mitochondrial membrane. The proton accumulation is necessary for energy transfer to the endergonic ADP phosphorylation process.
Lymph formed in your right hand will eventually drain into the:
Biomass produced by plants in oceans accounts for
Gibberellins was first discovered by
Formation of ATP in photosynthesis and respiration is an oxidation process which utilises the energy from
First chemical identification of auxin, indole 3-acetic acid, was carried out by
Oswald Tippo's classification is based on
Nitrogen fixation occurs in
Which one of the following substances plays an important role in biochemical defence of host plants?
Foul smell in the water bodies of tanks, ponds etc, is due to
Ostia are meant to
Which of the following biological processes is faster in human males than in human females?
Result of ozone hole is
Male gametophyte in angiosperms is reduced to
When yeast ferments glucose, the products are
Stem takes part in storage and perennation in
The number of chromosome present in leaf tip cells of a plant species, having 6 chromosomes in each of the 4 cell of its pollen tetrad, would be
Which of the following is an example of internal respiration?
Which one requires oxygen
The cilia found in the respiratory system function to
Pyruvic acid is formed at the end of
Increased levels of aldosterone cause
Which of the following organelles is found in large numbers in the cells, which line the proximal convoluted tubule?
Setae occur in earthworm in all segments except
Transpiration is regulated by movements of
Chloragogen cells are present in