The charge stored in the 4 μF capacitor in the electric circuit shown is
The voltmeter shown in the circuit has resistance of 400 Ω. Its reading will be
A capacitor of capacity 50 μF is connected to a constant source of emf 20 volt as shown in figure. Here R2 = 2 KΩ. The amount of heat produced in R1 = 3 KΩ, when the key is shifted from contact 3 to 2, is
A charged particle is moving in a uniform magnetic field in a circular path of radius R. When energy of the particle is doubled, then new radius will be
Magnetic susceptibility is positive and small for a
In a series LCR circuit the frequency of a 20 V AC voltage source is adjacent in such a fashion that the reactance of the inductor measures 30Ω and that of the capacitor is 22 Ω. If resistance R is 6 Ω, then the potential difference across the series combination of L and C will be
A perfectly reflecting mirror has an area of 2 cm2. Light energy is allowed to fall on it for 30 minute at the rate of 15 × 104 watt/m2. The force that acts on the mirror is
A small object is placed at a distance of 8 cmfrom a convex mirror of radius of curvature 24cm. The magnification of the image obtained is
A ray of light travels from an optically denserto a rarer medium. The critical angle for thetwo media is C. Without total internal reflectionthe maximum possible deviation of the raywill be
A plano-convex lens has refractive index 1.4and its radius of curvature is 40 cm. The focal length of the lens is
A telescope has an objective lens of focal length1 m and an eye piece with focal length 2 cm. Ifthis telescope is used to see a 25 m tall building at a distance of 1 km, then the height of theimage of the building formed by the objectivelens would be
In the following diagram all the wires are of same material and have uniform cross-section. The magnitude of magnetic field at the centre O of the square due to arm AB is B1 and dueto the arm CD is B2 then the ratio B1/B2 IS
After the half lives, 8 g of radioactive material remains in a sample. What will be the amount of substance at t = 0 s ?
In the given circuit the output y is given by
In the given figure a convex lens and concave mirror are separated by 40 cm. Position of final image is (from the pole of mirror)
In YDSE the fringe width is 0.06 mm. If thewavelength of light used is increased by 25%and the slit separation is decreased by 25% then fringe width will be
An unpolarised light of intensity I0 is incidenton a pair of two polaroids held coaxially such that their transmission axes make an angle of 30° with each other. The fraction of intensity oflight emerging from the pair is
The refracting angle of a prism is A and thecritical angle of the medium of the prism is QC.There will be no emergent ray when
If λ is de-Broglie wavelength of electron movingin nth orbit, then the radius of 3rd orbit in hydrogen atom is
Sky wave propagation can be used for frequencies
In a common emitter configuration collectorcurrent and emitter current are 3.09 mA and 3.19 mA respectively. The current gain in this configuration is
An arc of radius R is charged. The linear density of charge is λ and the arc subtends an angle 3/π at the centre. What is electric potential at the centre ?
In photoelectric effect, the electrons are ejectedfrom metals if the incident light has certain maximum
Current in the following circuit will be
Stopping potential in photoelectric experimentfor a given metal surface
A man runs towards a stationary plane mirror with velocity 15 m/s. Magnitude of velocity of the man relative to his image is
If ratio of amplitudes of two coherent sources producing an interference pattern is 3 : 4, then ratio of intensities at maxima and minima is
The sun maintains its brightness due to which of the following reactions in its core ?
The equivalent resistance between P and Q in the network shown is
Torque on a current carrying coil is maximumin a uniform magnetic field, when
The electric potential due to uniformly charged spherical shell of radius R and charge Q at distance r from center is (R < r)
A parallel plate capacitor has plates each of area A and separation d. If both the plate joined by conductor as shown, then capacitance C is
A dielectric of dielectric constant K is filled between plates of a parallel plate capacitor. When it is kept closed to A, midway between A & B and closed to B, capacitance in these cases are C1, C2 and C3 respectively, then
Which of the following graphs represents resistivity (p) with temperature (T) for semiconductor approximately ?
If the horizontal component of earth’s magnetic field is more than vertical component of earth’s magnetic field at a place, then angle of true dipat that place can be
A wire of fixed length is wound on a solenoid of length l and radius r and its self inductance is found to be L. Now if same wire is wound ona solenoid of length l/2 and radius r/2 , then theself inductance will be
Magnetic flux through a closed loop changes according to equation (φ) = 3t2 - 6t, where φ is in weber and t is in second. At what time instantaneous emf induced is zero.
Which of the following graph correctly shows the variation of capacitive reactance XC with frequency f ?
The power factor of LCR series circuit cannot be
In plane electromagnetic wave if average electric energy density is u, then average magnetic energy density is
A: Short wave bands are used for transmission of radio waves to a large distance.
R : Short waves are reflected by ionosphere
A: The speed of light in a rarer medium is greater than that in a denser medium.
R : One light year equals to 9.5 × 1012 km
A: The refractive index of a prism depends only on the kind of glass of which it is made of and the colour of light.
R : The refractive index of a prism depends upon the refracting angle of the prism and the angle of minimum deviation
A: Ultraviolet radiations of higher frequency waves are dangerous to human being.
R : Ultraviolet radiation are absorbed by the atmosphere.
A: The cloud in sky generally appears to be whitish.
R : Diffraction due to clouds is efficient in equal measure at all wavelengths
A: The stars twinkle while the planets do not.
R : The stars are much bigger in size than the planets.
A: In common base configuration, the current gain of the transistor is less than unity.
R : The collector terminal is reverse biased for amplification.
A: Cobalt-60 is useful in cancer therapy.
R : Cobalt-60 is source of λ-radiations capable of killing cancerous cell.
A: If the temperature of a semiconductor is increased then it's resistance decreases.
R : The energy gap between conduction band and valence band is very small
A: The binding energy per nucleon, for nuclei with atomic mass number A > 100, decreases with A.
R : The nuclear forces are weak for heavier nuclei.
A: An emf is induced in a closed loop where magnetic flux is varied. The induced is not aconservative field.
R : The line integral . around the closed loop is non zero.
A: Electrons move away from a low potential to high potential region.
R : Because electrons have negative charge.
A: If three capacitors of capacitance C1 < C2 < C3 are connected in parallel then their equivalent capacitance Cp > C3
A: The capacity of a given conductor remains same even if charge is varied on it.
R : Capacitance depends upon nearly medium as well as size and shape of conductor.
A: Electromagnet are made of soft iron.
R : Coercivity of soft iron is small.
A: A metallic shield in form of a hollow shell may be built to block an electric field.
R : In a hollow spherical shield, the electric field inside it is zero at every point.
A: Blue colour of sky appears due to scattering of blue colour.
R : Blue colour has shortest wave length in visible spectrum.
A: X-ray travel with the speed of light.
R : X-rays are electromagnetic rays.
A. undergoes 2 α - decays, 2β- decays and 2γ-decays and the daughter product is
R : In α- decays the mass number decreases by 4 and atomic number decrease by 2 . In β-decays the mass number remains unchanged, but atomic number increase by 1 only.
A: Speed of wave = time period / wavelength .
R :Wavelength is the distance between two nearest particles in phase.
A gas X at 1 atm is bubbled through a solutioncontaining a mixture of 1 M Y– and 1 M Z– at 25°C. If the reduction potential of Z > Y > X;then
Acidified chromic acid + H2O2 X and Y are
The number of unit cells in 58.5 g of NaCl is nearly :
The number of atoms in a face-centred cubicunit cell are-
A reaction having equal activation energies for forward and reverse reaction has-
The inversion of cane sugar is represented byC12H22O11 + H2O C6H12O6 + C6H12O6 It is a reaction of :
Which of the following statements is not applicable to chemisorption ?
In electrolysis of dilute H2SO4 using platinum electrodes :
The osmotic pressure at 17ºC of an aqueous solution containing 1.75 g of sucrose per 150 mL solution is-
For the reaction, 3A → Product, the rate law is rate = k[A]2. Half life of reaction is given by
Equal moles of benzene and toluene are mixed.The vapour pressures of benzene and toluene in pure state are 700 and 600 mm Hg respectively.The mole fraction of benzene in vapourstate is
reduction potentential of hydrogen electrode having a solution of pH 3 is (at 298 K and H2 gasis passed at 1 atm pressure)
pKa of 0.01 M weak acid is 6. pH of the acid will be
Which of the following mixture can act as buffersolution ?
Which of the following will not be soluble insodium hydrogen carbonate?
Which of the following will be most stable diazonium salt
Which of the following organic compounds hassame hybridization as its combustion product-(CO2)?
What products are formed when the following compound is treated with Br2 in the presence of FeBr3?
The IUPAC name of
Which order is correct regarding stability ofintermediates.
The number of structural isomers of C3H5Br3 is
Which of the following have zero dipolemoment?
Which will give white ppt. with AgNO3?
When CH2=CH–COOH is reduced with LiAlH4, the compound obtained will be –
In the given reaction :
(a) and (b) respectively be :
Number of products (excluding stereoisomers)in the given reaction :
Calcination is the process of heating the ore:
Which of the following does not contain Mg:
Refining of silver is done by:
In which of the following isolations no reducing agent is required:
Haber’s process, Mo is used as
N2(g) + 3H2 (g) 2NH3 (g);
X and Y are respectively.
Each of the following obey sidewick effective atomic number rule except
The magnitude of crystal field stabilisation energy in octahedral field depends on
I : the nature of the ligand
II : the charge on the metal ion
III : whether the metal is in the first, second orthird row of the transition elements.
Which of the following ligands is called π - acceptors ?
From the stability constant (hypothetical values), given below, predict which is the strongest ligand:
An orange solid (X) on heating, gives a colourless gas (Y) and a only green residue (Z). Gas (Y) on treatment with Mg, produces a white solid substance .................
A : NaCl forms an ionic crystal.
R : In NaCl atoms have electrostatic forces of attraction.
A : No compound has both Schottky and Frenkel defects.
R : Both defects change the density of the solids
A : If more and more solute is added to a solvent, the freezing point of the solution keeps on becoming higher and higher.
R : Presence of large amount of the solid solute does not allow the solution to freeze.
A : Silica gel is used for drying air.
R : Silica gel adsorbs moisture from air.
A : Conductance of a substance increases with decrease in resistance.
R : The inverse of resistance is called conductance.
A: For the reaction
H2(g) + I2 → 2HI (g),
Rate = K[H2][I2]
R: Rate of fornation of hydrogen iodide is proportional to the concentration of hydrogen and Iodine.
A : If in a zero order reaction, the concentration of the reactant is doubled, the half-life period is also doubled.
R : For a zero order reaction, the rate of reaction is independent of initial concentration.
A : p-Hydroxybenzoic acid has a lower boiling point than o-hydroxybenzoic acid. because
R : o-Hydroxybenzoic acid has intermolecular hydrogen bonding.
A : Basicity of CH3CH2NH2(I), NH3(II) and C6H5NH2(III) is in order I > II > III
R : Electron-donating groups (such as alkyl group) increase the basicity of amines, and electron-withdrawing groups (such as aryl group) decrease the basicity of amines.
A : Nitrobenzene is used as a solvent in Friedel-Craft's reaction.
R : Fusion of nitrobenzene with solid KOH gives a low yield of a mixture of o- and p-nitrophenols.
A : Grignard reagent reacts with aldehydes and ketones to form alcohol.
R : Alcohols have acidic hydrogen.
A : CH3OH is a nucleophile.
R : CH3OH forms sodium methoxide on treatment with NaOH.
A : N2 S reaction takes place in single step.
R : N2 S reaction involves the reactivity order of alkyl halides as 1° > 2° > 3° halides
A : Platinum and gold occur in native state in nature.
R : Platinum and gold are noble metals.
A : Al is used as a reducing agent in aluminothermy.
R : Al has a lower melting point than Fe, Cr and Mn
A : The highest oxidation state of chromium in its compounds is 6+.
R : Chromium atom has only six electrons in ns and (n–1) d orbitals.
A : [Co(NH3)3 Cl3] does not give a white precipitate with AgNO3 Solution.
R : Chlorine is not present in the ionisation sphere of [Co(NH3)3Cl3]
A: Cis-isomer of [Co(en)2Cl2)]Cl shows optical activity.
R: Cis-siomer of [Co(en)2Cl2] is a symmetric molecule.
A: Complexes containing three bidentate groups such as [Cr(ox)3]3- and [Co(en)3]3+ do not show optical activity.
R: Octahedral complex , [Co(NH3)4Cl2]Cl shows geometrical isomerism.
A: KMnO4 is purple in colour due to charge transfer
R: In , there is no electron present in d-orbitals of manganese.
Consider the following statements (a-d) about“terror of Bengal”
.a. An aquatic plant which can propagate vegetatively at a phenomenal rate.
b. One of the most invasie weeds growing in standing water.
c. It drains oxygen from water which leads to death of fishes.
d. It was introduced in Bengal because of its beautiful flowers and shape of fruits.
Which of the above statements are correct?
Given below figure represents some structures of (A) and (B). Identify these structures
What will be the ploidy of secondary nucleus PEN if the cross is made between 4n plant and 8n plant.
Find the incorrect statement
Match the Column-I with Column-II correctly
Which of the following is incorrect w.r.t. SCP?
Which of the following statement is incorrect w.r.t. micropropagationa.
(a) It is helpful for somaclonar variationb.
(b) It helps in rapid multiplication of endangered speciesc.
(c) It is more economical for plant propagationd.
(d) It is useful for production of new variants
Select the correct match with respect to crop,variety and resistance to diseases
Find the incorrect statement
A typical agarose gel electrophoresis showning migration of digested DNA fragments
Which of the following statement is correct?
Mark the incorrect one w.r.t. Exotic species
Key industry animals are
Raunkiaer, grouped species into Five frequency classes A, B, C, D and E. Which one of the following is the correct representation of Raunkiaer’s frequency classes
In Bryophyllum vegetative propagation is brought about by
What is true for cotyledon is grass family?
Which one of the following pair is wrongly matched?
Match the following (Column-I with Column- II)
There are two opposing views about origin of modern man. According to one view Homo erectus in Aisa were the ancestors of modern man. A study of variation in DNA, however suggested African origin of modern man. What kind of observation of DNA variation could sugest this?
Which is correct about the protein brazzein which was patented in USA by America?
Maximum average height of plant is 60" and that of minimum is 20". The height of the plant with genotype aaBbCcDD will be
Plants that complete their life cycle during rainy season and pass rest of their time in the form of seeds are called
The above given pedigree can’t be a/an
In a trihybrid cross between AABBCC and aabbcc the ratio of AaBbcc, aaBbCc, AAbbCc, aaBBCc in F2 generation is
Identify the label A, B, C and D in given structre of tRNA & select the correct option
Organic evolution would not have taken place if
Read the following statementa.
(a) Propionibacterium sharmani is use to produce swiss cheeseb.
(b)Streptokinase is uses as clot busterc.
(c) Cyclosporian A is used as cholesterol lowering agentd.
(d)Statins produce by monascus purpureus
Find the incorrect options
Consider the following sample area (1) and (2) and indicate the correct answer :
Sample Area-1 : There are three species of birds. Two species are represented by one individuals each, while the third species has four individuals.
Sample Area-2 : There are three species of birds and each species are represnted by two idividuals.
Species diversity increases as one proceeds from
Edge effect is
Identify the plant given below :Choose the incorrect statement w.r.t. drug obtained from the given plant :
Which of the following pair is mismatched?
Which of the following is incorrectly matched pair of structure w.r.t. function?
The following graph shows the range of variation among population members for a trait determined by multiple genes
If this population is subject to stabilising selection for several generations, which of the distribution is most likely to result?
Which of the following is the correct sequence fo the layers in the mature follicle from inside to outside?
a. Zona pellucida
b. Membrana granulosac.
c. Theca externad.
d. Plasma membrane of ovume.
e. Corona radiataf.
f. Theca interna
Which of the following mophogenetic movements involves the rolling in of chordamesoderm cells towards anterior side along the roof of blastocoel?
Which of the following applications can be used to avoid possible pregnancy within 72 hours of coitus due to rape or casual unprotected intercourse?
b. Progestogen-estrogen combinationc.
Choose the correct type of placenta with number of barriers w.r.t. human beings
Placental mammals in Australia exhibit adaptive radiation in evolving into varieties of placental mammals each of which appears to be similar to a corresponding marsupial. What kind of evolution is exhibited by them w.r.t. each other?
What does not normally happen during gastrulation?
A : In Penicillium, asexual reproductive structures are formed on sterigmata.
R :The conidiophore is unbranched and coenocytic.
A : Human skin colour is an example of polygenic inheritance.
R : It is controlled by more than one gene.
A : The physical distance between two genes determines both the strength of linkage and frequency of crossing over between two genes.
R :One cross-over reduces the occurrence of another cross-over in its vicinity.
A : The law of segregation is one of the most important contributions to the biology.
R : It introduced the concept of heredity factors as discrete physical entities which do not become blended.