In a full wave rectifier with input frequency 50 Hz, the ripple in the output is mainly of the frequency (in Hz)
A particle of mass 0.6 gm and having charge of 25 nC is moving horizontally with a uniform velocity 1.2 x 104 ms-1 in a uniform magnetic field, then the value of the magnetic induction is (g = 10 m s-2 )
A series combination of R,L,C is connected to an a.c. source. If resistance is 3 Ω and the circuit is :
A fighter pilot flies along a vertical circle of radius 1 km. At the topmost point of the circle, he feels weightless. What is the speed of the fighter plane? (Acceleration due to gravity = 10 ms–2)
The resistance of an incandescent lamp is
Superconductivity was observed when the temperature of mercury was cooled down to
The coefficient of mutual inductance, when magnetic flux changes by 2 X 10-2 Wb and current changes by 0.01 A is
Radio wave diffract around building although light waves do not. The reason is that radio waves:
A parallel plate capacitor C with plates of unit area and separation d is filled with a liquid of dielectric constant K = 2. The level of liquid is d 3 initially. Suppose the liquid level decreases at a constant speed V, the time constant as a function of time t is
In a gravitational field, the work done in transporting mass from one point to another
A block of 1 kg is stopped aganist a wall by aplying a force F perpendicular to the wall. If μ = 0.2 then minimum value of F will be
F = W/μ = 1 x 9.8/0.2 = 49 N
A 10 μF capacitor is charged to a potential difference 50 V and it is then connected to another uncharged capacitor in parallel. If common potential difference becomes 20 V, then capacitance of the second capacitor is
A condenser stores
If a planet consist of a satellite whose mass and radius were both half that of the earth, the acceleration dur to gravity at its surface would be (g on earth = 9.8 m/sec2)
At a common temperture, a block of wood and a block of metal feel equally cold or hot. The temperatures of block of wood and block of metal are
In Young's double slit experiment, if one slit is covered with red filter and the other slit is covered by green filter, then their interference pattern will be
Interference Pattern will be invisible, because red and green are complimentary colours
A cell is connected between two points of a uniformly thick circular conductor. i₁ and i₂ are the currents flowing in two parts of the circular conductor of radius a. The magnetic field at the centre of the loop will be
On reducing the volume of the gas at constant temperature, the pressure of the gas
An electron moves in a circular orbit with a uniform velocity v. It produces a magentic field B at the centre of the circle. The radius of the circle is proportional to
The susceptibility of magnetic substance for different purposes is determined by its
A 50 Ω galvanometer gets full scale deflection when a current of 0.01 A pass through the coil. When it is converted to a 10 A ammeter, the shunt resistance is
The field of a short bar magnet at a distance of 1 m on its axial line is 1 oersted. At a distance of 2 m on the same line, the intensity in oersted will be
The magnetic field at a point at a distance 'd' from the centre on axial line of a very short bar magnet of magnetic moment M is B. The magnetic field at a distance '2d' from centre on equitorial line of magnet of magnetic moment 8 M, will be
A solid of density ρ₁ is floating in a liquid of density ρ₂. If ν is the volume of solid submerged in the liquid and V is the total volume of the solid, the ν/V is equal to
Horizontal tube of non-uniform cross-section has radii of 0.1m and 0.05m respectively at M and N. For a streamline flow of liquid the rate of liquid flow is
A cube is subjected to a uniform volumatric compression. If side of cube decreases by 1%, then its bulk strain is
Three point masses m₁,m₂,m₃ are located at the vertices of an equilateral triangle of length 'a'. The moment of inertia of the system about an axis along the altitude of the triangle passing through m₁ is
A car accelerated from initial position and then returned at initial point, then
Newton's first law of motion describes the following
In gamma ray emission from a nucleus
Mass - energy equation was proposed by
Four lenses of focal length + 15 cm, + 20 cm, + 150 cm and + 250 cm are available for making an astronomical telescope. To produce the largest magnification, focal length of the eye-piece should be
A large horizontal surface moves up and down in simple harmonic motion with an amplitude of 1 cm. If a mass of 10 kg (which is placed on the surface) is to remain continuously in contact with it, the maximum frequency of simple harmonic motion will be
The photo-electrons emitted from a surface of sodium metal are such that
Which of the following is not dependent on the intensity of incident radiation in a photoelectric experiment ?
The range of a particle when launched at an angle of 15o with the horizontal is 1.5 km. What is the range of the projectile when launched at an angle of 45o to the horizontal
To get three images of a single object, one should have two plane mirrors at an angle of
Green light of wavelength 5460 Å is incident on an air glass interface. If refractive index of glass is 1.5, then wavelength of light in glass would be
An eye specialist prescribes spectacles having a combination of a convex lens of focal length 40 cm in contact with a concave lens of focal length 25 cm. The power of this lens combination will be
When light enters from air to water, then its
The moment of inertia of a body comes into play
Two identical springs are connected (a) in series and (b) in parallel. The combination supports a mass at the lower end. The ratio of the periods of vertical oscillations of the mass in series and parallel combinations is
A seconds pendulum is taken from earth to moon. If it is to act as a seconds pendulum there also, the length of the pendulum,
The transistors provide good power ampli-fication when they are used in
Which of the following, when added as an impurity atom in the silicon, produces n-type semiconductor?
In a stationary wave pattern of a wavelength 0.4 m, the distance between node and adjacent antinode is
What is ratio of surface energy of 1 small drop and 1 large drop, if 1000 small drops combined to form 1 large drop?
A (100 W, 200 V) bulb is connected to a 160 V power supply. The power consumption would be
An electric bulb of 100 watt is connected to a supply of electricity of 220 V. Resistance of the filament is
An electric lamp is marked 60 W, 230 V. The cost of a 1 Kwh of energy is Rs. 1.25. The cost of using this lamp 8 hrs a day for 30 days is
The graph between temp in oC and pressure of a perfect gas is
In which process the P-V indicator diagram is a straight line parallel to volume axis
At 27oC a gas is suddenly compressed such that its pressure becomes 1/8th of original pressure. The temperature of the gas will become(γ=5/3)
Dimensions of 1/μ₀ε₀, where symbols have their usual meaning, are
Dimensional analysis of the equation (velocity)x = (Pressure difference)3/2 (density)-3/2 gives value of x is
In Young's double slit experiment, the width of the fringes obtained with light of wavelength 6000 Angstrom is 2.0mm. The fringe width, if the entire apparatus is immersed in a liquid of refractive index 1.33, will be
Fringe width in Young's double slit experiment β = Dλ/d
When apparatus is immersed in liquid, only wavelength of light (λ) changes
Wavelength of light is liquid,
λ' = λ/n , where n = refractive index of medium
Initial fringe width, β = Dλ/d .....(i)
Fringe width in liquid, β' = Dλ'/d .....(ii)
Dividing Equation (ii) by Equation (i), we get
β'/β = λ'/λ
or β'/β = λ n/λ = 1/n
or β' = β/n
The new fringe width, β' = 2.0/1.33 mm = 1.5 mm
If wavelength of a photon is 6000 Å, then energy of this photon will be
What should be the velocity of a sound source moving towards a stationary observer so that apparent frequency is double the actual frequency (Velocity of sound is υ)
A plane wave is described by the equation y = 3 cos (x/4 - 10t - π/2). The maximum velocity of the particles of the medium due to this wave is
One-fourth chain is hanging down from a table. The work done to bring the hanging part of the chain on the table is
Which of the following product is finally formed, when alkyne reacts with hydrogen in presence of Ni catalyst?
The chloroform reacts with NaOH to give
The homologue of ethyne is
C2H2 is Ethyne (homologue of alkyne)
C3H4 is propyne (homologue of alkyne)
C3H8 → propane (homologue of alkane)
C2H6 → Ethane (homologue of alkane)
The presence of magnesium is confirmed in the qualitative analysis by the formation of a white crystalline precipitate which is due to
When the azimuthal quantum number l=1, the shape of the orbital will be
For principle quatum number n = 4, the total number of orbitals having l = 3 is
The set of quantum numbers not applicable to an electron is
A σ - bond is
According to the Fajan's rule, covalent bond is favoured by
The bond angle and dipole moment of water respectively are
Given : C + 2S→CS₂ ; ∆H = 117 KJ
C + O₂→CO₂; ∆H = -393 KJ
S + O₂→ ; ∆H = -297 KJ
The heat of combustion of CS₂ to form CO₂ and SO₂ is
Cu2+ reacts with Fe2+ ions according to the reaction Cu2++ Fe2+ ⇌ Cu+ + Fe+3 . AT equilibrium the concentration of Cu2+ is not affected by the addition of
Which of the following statements about the catalyst is true?
Two moles of an ideal gas are compressed at 300 K from a pressure of 1 atm to a pressure of 2 atm. The change in free energy is
The amount of heat required to raise the temperature of one mole of the substance through 1 K is called, its
Alizarin belongs to the class of
A compound contains atoms of three elements A, B and C. If the oxidation number of A=+2, B=+5 and C= -2, the possible formula of the compound is
As compound formed from different ions always has zero valancy i.e. it is a neutral atom. Thus, valancy of A3(BC4)2 :
= 3 x (+2) + 2 x (+ 5) + 2 x (4 x − 2 )
= 6 + 10 − 16 = 0
The IUPAC name of
According to Lewis, the ligands are
The unit ohm-1 is used for
The important oxide ore of iron is
A real gas most closely approaches the behaviour of an ideal gas at
The compressibility factor of an ideal gas is
What is hybridization of P in Pcl₅ ?
The reactivity of the alkali metal sodium with water, is made use of
Which metal is protected by a layer of its own oxide?
Oxalic acid reacts with conc. H2SO4 to give a mixture of two gases. When this mixture is passed through caustic potash. One of the gases is absorbed. What is the product formed by the absorbed gas with caustic potash
Silica is soluble in
As it forms hydroffuorosilicate
A chloride dissolves appreciably in cold water. When placed on a platinum wire in Bunsen flame no distinctive colour is noted, which cation would be present?
Which of the following behaves as both oxidising and reducing agents?
The reaction of KMnO₄ and HCl results in
Zeolite,which shows ion exchange ability
The pH of a solution is increased from 3 to 6; its H⁺ ion concentration will be
The indicator used in the titration of sodium carbonate with sulphuric acid is
A radioisotope has a 1/2 of 10 days. If today 125 g of it is left, what was its weight 40 days earlier?
Glacial acetic acid is obtained by
Ammonium ion is
Which of the following will exhibit geometrical isomerism?
Artificial radioactivity was discovered by
Which of the following compounds is used as a refrigerant?
Weakest acid among the following is
In its reaction with sodium, 1 mol of a compound X gives 1 mol of H₂. Which one of the following compounds might be X?
Which of the following compounds can react with the Lewis base Cl- in a Lewis acid-base reaction?
Which of the following is incorrect?
Which of the following compound turns black on addition of NH₄OH?
following step is :
CH3 CH3 + Cl- → CH3CH2 + HCl
Which of the following is used for making horses, shoe heels and stoppers?
Sodium phenoxide reacts with CO₂ at 400K and 4.7 atm pressure to give
Steam distillation is used for the purification of
Which of the following has the same oxidation state as that of Cr in K₂CrO₃
SnCl₂ gives a precipitate with a solution of HgCl₂. In this process HgCl₂ is
A match box exhibits
2N-HCl will have the same molar concentration is
6 grams of urea is dissolved in 16.2 grams of water at 25 oC . What is the vapour pressure (in mm) of the resultant solution? The vapour of water at 25 oC is 24 mm
The number of moles of AgCl precipitate when excess of AgNO₃ is added to one mole of [Cr(NH₃)₄ Cl₂] Cl is
Which conformation for ethane has the lowest potential energy?
Which of the following is not true for transition elements ?
Which is used in ending charge on colloidal solution?
Mercury sticks to the surface of the glass when it comes in contact with
Which of the following blood vessels has a thin elastic layer?
Significance of mitosis is in
Scorpion is member of a class to which also belongs
Coelenterates differ from other animals in having :
Which are the largest of the white blood cells?
If a newborn was blood type O+, which of the following would his blood not contain?
Proteins are digested or broken down by the _____ in the stomach.
Sunflower is principally cultivated for its or (sunflower is)
What hormone does the small intestine release in response to acidic chyme?
In cauliflower which part of the plant is edible?
Which state in India is the largest producer of sugarcane?
Triticale is the hybrid between wheat and
Which of the following can fix atmospheric nitrogen?
The silkworm larva ceases to eat and starts spinning silk around its body
In an ecosystem, trophic level of man is
Which of the following pair of geographical areas show maximum biodiversity in our country?
During extreme aridity, Desert Rat
Out of 64 codons, 61 codons code for 20 types of amino acid. It is called
The organ which was considered vestigial till recently but now confirmed to be endocrine gland is
Which one of the following conditions though harmful in itself, is also a potential saviour from a mosquito borne infectious disease ?
Dictyledonous leaf showing parallel venation belongs to the genus
RrYy yields gamete types
Man has achieved mastery over his enviroment through improvement in
In bacteria, plasmid is
When birth and death rates are equal, the population is
Anterior irregular wavy part of retina is
What is correct about Taenia?
The part of eye acting as a diaphragm of camera is
The cells within the thymus gland probably originated from the _____.
Which of these is not a function of lymph nodes?
Minerals absorbed by roots move to the leaf through
In which of the following animal, the milk is squirted down the throat of the baby by muscular contraction of mother?
Which of the following is detrimental to pearl industry?
Fuel wood crisis can be overcome by
Mass flow hypothesis explains
The correct sequence of taxonomic categories is
If a tree flowers thrice in a year in October, January and July in northern India, the plant is
Mowing grass lawn facilities better maintenance because
That oxygen produced during photosynthesis comes from water was proved by
Which one of the following substances plays an important role in biochemical defence of host plants?
Curd, milk, cheese and butter are produced with the use of
In which one of the following pathogens do the cells of promycelium after the germination of teleutospore produce infection hyphae instead of basidiospores?
Chernobyl nuclear tragedy occurred in
Maximum permissible noise as per Noise Pollution Rules 2000 is
Classification of phylum Porifera is primarily based on:
The most accepted theory of ageing is
Cotton fibres are the outgrowths from
Water is not required in the fertilization of
Maximum energy becomes available per mole of glucose when it is metabolised through
Common immediate source of energy in cellular activity is
Which of the following reactions would be considered a part of external respiration?
The correct sequence of structures through which air passes during inhalation is
Stem modification found in Gladiolus is
In biological terminology, a group similar organisms which are actually or potentially capable of successful interbreeding with the production of fertile offspring is generally referred to as -
The component units of compound eye of Cockroach are called
RBCs are nucleated in
. Low levels of sodium ions Na+ in the body result in the secretion of
In root hair, water enters due to