A step up transformer connected to a 220 V AC line is to supply 22 kV for a neon sign in secondary circuit. In primary circuit a fuse wire is connected which is to blow when the current in the secondary circuit exceeds 10mA. The turn ratio of the transformer is
An electron and a proton have the same wave length. Which one of the following statements is correct about them?
de-Broglie wavelength λ = h/p where p = h/√2mE
∴ λ = h/√2mE
⟹λ ∝ 1/√m (∵ E = constant)
As me < mp
⟹ λp < λe
Thus proton has smaller wavelength.
Evidence for the wave nature of light cannot be obtained from
Emission of electrons in the photoelectric effect is possible, if
A heavy mass is attached to a thin wire and is whirled in a vertical circle. The wire is most likely to break
If there is an increase in length by 0.1% due to stretching, the percentage increase in its resistance willbe
A 2 Ω resistor is connected inseries with R Ω resistor. This combination is connected across a cell. When the potential difference across 2 Ω resistor is balanced on a potentiometer wire, null point is obtained at a length of 300 cm. When the same procedure is repeated for R Ω resistor, null point is obtained at a length of 350 cm . Value of R is
For only R=2Ω
Balance Length L=300cm
For RΩ resistance in series
Balance length L=350cm
From the potentiometer principal,
An electron remains undeflected when passing perpendicular to mutually perpendicular electric and magnetic fields. If the magnetic field is 8 Gauss and elecric field is 4000 V/m, the velocity of the electron is
Electric force balances magnetic force. so net force on an electron will be zero.
qE = qvB
E = vB
v = E/B
v = 4000/(8*10-4)
v = 5 * 106 m/s
In a discharge tube at 0.2 mm of Hg pressure, there is a formation of
The de-Broglie wavelength of an electron in the first Bohr orbit is
Which of the following is true for photon
Which of the following electromagnetic waves have the smallest wavelength?
Which of the following radiations has the least wavelength?
An L.C. circuit contains 10 mH inductor and a 25 μ F capacitor. The resistance of the circuit is negligible. The energy stored in the circuit is completely magnetic at time (in milli seconds) being measured from the instant when the circuit is closed
When R is negigible,
Therefore, t = 1.57, 4.71, 7.85 ... milli sec
At a point A, there is an electric field of 500 V-m⁻1 and potential difference of 3000 V. The distance between the point charge and the point A is
The escape velocity of an object on a planet whose radius is 4 times that of the earth and acceleration due to gravity 9 times that on the earth is
Two capacitors of capacity 4 μF and 6 μF are connected in series and a battery is connected to the combination the energy stored is E1. If they are connected in parallel and if the same battery is connected to this combination the energy stored is E2. The ratio of E1 and E2 is
As the capacitors are connected in series
A gas exerts pressure on the walls of the container, because the gas molecules
A stone of mass m is tied to a string and is moved in vertical circle of radius r making n revolutions per minute. The total tension in the string when the stone is at lowest point is
A body takes 5 minutes for cooling from 50°C to 40°C. Its temperature comes down to 33.33°C in next 5 minutes. Temperature of surroundings is
A rectangular loop carrying current i is placed in a uniform magnetic field B. The area enclosed by the loop is A. If there are n turns in the loop, the torque acting on the loop is given by
In a deflection magnetometer experiment in tan A position, a short-bar magnet placed at 18 cm from the centre of the compass needle produces a deflection of 30° . If another magnet of same length but 16 times pole strength as that of first magnet is placed in tan B position at 36cm, the deflection will be
The pole strength of a 12cm long bar magnet is 20 A-m. The magnetic induction at a point 10cm away from the centre of the magnet on its axial line is ( μ 0 4 π = 10-7 Hm-1 )
We known 2l = 12cm = 0.12m
m = 20 Am and d = 0.1m
If iron pieces loaded in a ship, are thrown into the water, then level of water will
The Young's modulus of a wire of length (L) and radius (r) is Y N-m⁻2. If the length is reduced to L/2 and radius to r/2, then Young's modulus for the wire will be
The number of beta particles emitted by a radioactive substance is twice the number of alpha particles emitted by it. The resulting daughter is an:
The above is a plot of binding energy per nucleon Eb, against the nuclear mass M;, A, B, C, D, E, F correspond to different nuclei. Consider four reactions:
(i) A + B → C + ε
(ii) C → A + B + ε
(iii) D + E → F + ε and
(iv) F → D + E + ε
Where ε is the energy released ? In which reactions is ε positive?
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
If a simple pendulum oscillates with an amplitude 50 mm and time period of 2 s, then its maximum velocity, is
For what distance is ray optics a good approximation when the aperture is 4 mm wide and the wavelength is 500 nm?
If the luminous intensity of a unidirectional bulb is 100 candela, then total luminous flux emitted from the blub, is
If the earth were to suddenly contract to half of its present radius, then change in the duration of the day will be (Assume earth to be a perfect solid sphere of moment of inertia =2/5 MR2)
A hollow cylinder and a solid cylinder having the same mass and same diameter are released from rest simultaneously from the top of an inclined plane. Which will reach the bottom first
Two mutually perpendicular simple harmonic vibrations have same amplitude, frequency and phase. When they superimpose, the resultant form of vibration will be
In comparison to a half wave rectifier, the full wave rectifier gives lower
The typical ionisation energy of a donor in silicon is
When donor impurity (+5 valence) added to a pure silicon (+4 valence) , the +5 valence donor atom sits in the place of +4 valence silicon atom. So it has a net additional +1 electric charge. The four valence electron from covalent bond and get fixed in the lattice. The fifth electron (with net −1 electronic charge) can be approximated to revolve around +1 additional charge. The
When a copper voltameter is connected with a battery of emf 12 volts. 2 gms of copper is deposited in 30 minutes. If the same voltameter is connected across a 6 volt battery, then the mass of copper deposited in 45 minutes would be
If a ball of 80 kg mass hits an ice cube and temperature of ball is 100°C, how much ice becomes water? Specific heat of ball is 0.2 cal/gram.
The height of a waterfall is 84 metre. Assuming that the entire kinetic energy of falling water is converted into heat, the rise in temperature of the water will be
(g = 9.8 m/s2, J=4.2 joule/cal)
Dimensions [ML⁻1T⁻1] is related with
The frequency of a radar is 780 MHz. The frequency of the reflected wave from aeroplane is increased by 2.6 kHz. The velocity of the aeroplane is
In a closed organ pipe, the 1st resonance occurs at 50 cm. At what length of pipe, the 2nd resonance will occur?
Water is flowing on the blades of a turbine at a rate of 100 kg-s⁻1 from a certain spring. If the height of the spring be 100 m, then power transferred to the turbine will be
If the force acting on a mass is not a constant, but it is linearly changing as in the case of a mass attached to spring, the force itself is proportional to the extension or compression of the spring. The work done in moving a body by extending a spring by x is
The work done is the area of the triangle OAB = 1/2 Fx
It is the force that is varying with x and it is linearly increasing with x, (1/2 F)x x satisfies the logic better though mathematically this is the same as F x/2.
A body of weight 'mg' is hanging on a string, which extends its length by l. The work done in extending the string is
The reaction of ethanol with H₂SO₄ does not give
Which does not react with Fehling solution ?
Propanone is methyl ketone
So ketones do not react with fehling's solution
For principle quantum number n = 4, the total number of orbitals having l = 3 is
The wavelength of light waves is inversely proportional to its
Which of the following does not show electromeric effect?
The bromination of benzene in presence of FeBr₃ is an example of
Oxidation of glucose is one of the most important reactions in a living cell. What is the number of ATP molecules generated in cells from one molecule of glucose?
Which one of the following molecules is paramagnetic?
Which of the following is the weakest acid ?
The maximum possible number of hydrogen bonds in which a water molecule can participate is
Which relation is correct ?
When one mole of the gas is heated at constant volume ,temperature get raised from 298 K to 308 K.Heat supplied to the gas is 500 J.Then which among the following is a correct statements ?
As the gas is heated at constant volume. Therefore ΔV = 0, and W = 0 and at the same time q = ΔU
In a chemical equilibrium Kc = Kp when :
Kp = Kc when Δn = 0
What is the rate of a reaction in mol-L⁻1-s⁻1 in a first order reaction, if its half-life period is 693 s, and its concentration is 2 mol-L⁻1?
Identify the reaction in which the heat liberated corresponds to the heat of formation (Δ H)
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
Which of the following is used for inducing sleep?
The compound which has one isopropyl group is
Which of the following will give maximum number of isomers?
Which one of the following does not obey the 18-electron rule?
If the standard electrode potential of Cu2+/Cu electrode is 0.34 V, what is the electrode potential at 0.01 M concentration of Cu2+? (T = 298K)
A current liberates 0.504 g of hydrogen in 2 hours, the amount of copper liberated from a solution of CuSO₄ by the same current flowing for the same time would be
Consider the following four electrodes
If the standard reduction potential of Cu+2 ∕ C u is + 0.34 V , the reduction potential (in volts) of the above electrodes follow the order
The elements or organisms which consume a pollutant, are known as
Which of the following process is used in the extractive metallurgy of magnesium?
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
Excess of N⁺ ions in human system causes
The increasing of the concentration of Sodium ions in blood would attract water from the surrounding issues, because of the osmotic pressure.
The increasing of the total volume of blood makes the blood pressure higher.
Hence, Option D is the correct answer.
The temperature at which real gases obey the ideal gas laws over a wide range of pressure is called
Which of the following is most dense?
Which of the following cannot work as oxidizing agent?
Which of the following salts on dissolution in water gives pH less than 7 at 25°C ?
If the solubility of PbCl₂ at 25°C is 6.3x10⁻3 mole/litre, its solubility product at that temperature is
Which one of the following methods is neither meant for synthesis nor for separation of amines ?
Stability of following alkenes in the increasing order is:
I have 6 α-H. II has 12 α-H. III has 6 α and IV has 9 α-H.
However among I and III, III is more stable as after hyperconjugation in I and III,I has 2° carbanion which is less stable than 1° carbanion in III.
So, the order of stability is :-
Polyvinyl alcohol can be prepared by
In which case product formed is identical in the absence or presence of peroxide?
If 0.24g of a volatile liquid upon vapourization gives 45ml of vapours at NTP. What will be the vapour density of the substance? (Density of H = 0.089 gL⁻1)
Volume of 0.1 M K₂Cr₂O₇ required to oxidise 35 ml of 0.5 M FeSO₄ solution is
If 0.32 g of an organic compound containing sulphur produces 0.233g of BaSO₄. Then the percentage of sulphur in it is
Which of the following can act as an oxidising as well as reducing agent ?
How many moles of Fe2⁺ ions are formed when excess iron is treatd with 500 mL of 0.4 N HCl under inert atmosphere? Assume no change in volume?
What happens when isotonic solution of A (mol.wt.342) and B (mol. wt.60) are put into communication through semipermeable membrane?
Both acid and base may react with which of the following oxides?
Which of the following can't be explained by adsorption?
Which of the following properties is not of transition elements ?
Bryophytes can be differentiated from algae because they
A true terrestrial animal is
Funaria rhizoids are distinguished by which of the following character
The stage of cell cycle when cell has undergone differentiation is
If mitotic division is restricted to G₁ phase of cell, the condition is known as
Funaria gametophyte is
ER remain associated with
Each phospholipid molecule in a cell membrane consists of :
Red blood cells survive around _____ days.
Phragmoplast is formed during
A colour blind girl is rare because she will be born only when
Sudden inheritable genetic change is
Which of the following is not true?
The stem cells that give rise to all red blood cells, white blood cells, and platelets are known as:
Population explosion has occurred in the last :
Progesterone is generally present in contraceptive pills. Its function is to :
The function of copper-T is to prevent
When salivary amylase enters the stomach, it becomes
An ecosystem is
Which of the following is true of the liver?
Which of the following pair of geographical areas show maximum biodiversity in our country?
During menstruation the level of progesterone in the blood is
The organ which was considered vestigial till recently but now confirmed to be endocrine gland is
Nonprotein component of enzyme is
Of the total enzymes present in a cell, mitochondria account for
Which of the following monkey has prehensile tail?
Largest sperms are found in-
The male gametes (spermatozoids) of Cycads and Ginkgo are unique among seed plants. It is multiflagellate and very large.
Gymnosperms are naked-seeded plants, because
F₂-generation is produced by
In E.coli, during lactose metabolism repressor binds to
Which of the following charaters studied by Mendel in garden pea (Pisum sativum) was dominant ?
The bone attached to the inner surface of the eardrum is called
Antigens are found
Western blot test is used for confirmation of
What is characteristic of deuterostomes
Cell-tissue organisation occurs in
A disease due to allergic reaction is
An organism which lacks sterile covering over its egg is
Which do not give out O₂
Which is source of Vitamin B₁₂
Spirulina is rich in nutrients, some of which aren't found in the average daily vitamin. According to the FDA, Spirulina contains significant amounts of calcium, niacin, potassium, magnesium, B vitamins and iron. It also has essential amino acids (compounds that are the building blocks of proteins).
Lipids are insoluble in water as they are
Lipids are basically fats and oils neither of which soluble in water because their molecules are nonpolar and they are not attracted by water molecules.
In cockroach, oxygen is transported to the tissues of the body by
Apposition image in cockroach is formed when there is
Ootheca of Earthworm is produced by
Chloragogen cells of Earthworm take part in
In general ,the feature common to the flower of spadix,cyathium and hypanthodium is that they are
Transpiration is reduced in Opuntia by the formation of
Hypanthodium refers to specialised type of
A one chambered one seeded indehiscent fruit developed from bicarpellary syncarpous ,inferior ovary is
Stomata are sunken in
The main function of cerebrospinal fluid is
Soil rich in Fe and Al due to excessive leaching is
Association between suckerfish and shark is :
An important example of serendipity is
Biotechnologically produced erythropoitin is produced with the help of
Yeast belongs to the class
Agricultural chemicals include
A new strain of bacteria produced by biotechnology in alcohol industry is
Plant medium used widely in preparation of culture medium is got from
A fungus used for the fermentation of cheese is
Lung Fluke is
Vessels and companion cells occur in
Resin ducts of Pinus are an example of
B.O.D. is connected with
The undesirable sounds, which disturb our environment, are called
A community which starts succession in a habitat is
The aggregate of processes that determine the size and composition of any population is known as
In acid rain, sulphuric acid accounts for
Maturation of stamens and pistils, at different times in the same flower, is called
A plant raised from a single germinating pollen grain under cultural condition is called a
Pollination by bats is called
Microspore mother cell forms
The genetic sex of a child is determined by the