There is a 5Ω resistance in an A.C, circuit. Inductance of 0.1H is connected with it in series. If equation of A.C. e.m.f. is 5sin50t then the phase difference between current and e.m.f. is
Moseley's law states that
The frequency of characteristic X-ray spectral line is directly proportional to the square of atomic number of target element.
Here a is constant of proportionality b is screening constant.
Three resistance R, 2R and 3R are connected in parallel to a battery. Then
A 10 μ F capacitor is charged to a potential difference of 50 V and is connected to another uncharged capacitor in parallel. Now the common potential difference 20 volt. The capacitance of second capacitor is
The resistance of a conductor increases with
A stone of mass 1 kg tied to the end of a string of length 1 m, is whirled in a horizontal circle with a uniform angular velocity of 2 rad/s. The tension of the string is (in N)
m = 1 kg
r = 1 m
ω = 2 rad/s
In an A.C. circuit, maximum value of voltage is 423 volt. Its effective voltage is
Van de Graaff electrostatic generator is based on
Minimum no. of 8 μF and 250 V capacitors, used to make a combination of 16 μF and 1000 V, is
The fact that radiosignals reach the earth from outside the atmosphere, was discovered accidently by
A body of weight 64N is pushed with just enough force to start it moving across a horizontal floor and the same force continues to act afterwards. If the coefficients of static and dynamic friction are 0.6 and 0.4 respectively, the acceleration of the body will be
The value of g on the moon is 1/6th that on earth. A body weighing 60 kg on the earth, has weight on the moon
Time period of revolution of a satellite around a planet of radius R is T. Period of revolution around another planet, whose radius is 3R but having same density is
In an L-R circuit, the value of L is (0.4/π) henry and the value of R is 30 ohm. If in the circuit, an alternating emf of 200 volt at 50 cycles per second is connected, the impedance of the circuit and current will be
L = 0.4 π henry, R = 30 ohm
e = 200 volt, f = 50
I = ?, Z = ?
Impedance of L-R circuit
Z = R2 + XL2
= R2 + 2π f L 2
= 302 + 2 π x 50 x 0.4 π2
= 30 2 + 402
900 + 1600 = 2500 = 50 ohm
I = e Z = 200 50 = 4 amp
The temperature of a gas at pressure P and volume V is 27oC. Keeping its volume constant if its temperature is raised to 927oC, then its pressure will be
On a new scale of temperature (which is linear) and called the W scale the freezing and boiling points of water are 39o W and 239o W respectively. What will be the temperature on the scale, corresponding to a temperature of 39o C on the Celsius scale ?
In Young's double slit expt., using sodium light (λ = 5898 Å), 92 fringes are seen. If given colour (λ = 5461Å) is used, how many fringes will be seen?
By using n1λ1 = n2λ2
⇒ 92 x 5898 = n2 x 5461
⇒ n2 = 99
A length L of a wire carries a steady current I. It is bent first to form circular plane coil of one turn. The same length is now bent more sharply to give a double loop of small radius. The magnetic field at the centre caused by the same current is
A circular coil of radius 2R is carrying current i . The ratio of magnetic field at the centre of the coil and at a point at a distance 6R from the centre of the coil on the axis of the coil is
A charge q moves on a region where electric field and magnetic field both exist, then force is
A certain amount of current when flowing in a properly set tangent galvanometer, produces a deflection of 45o. If the current be reduced by a factor of √3, the deflection would
At a certain place, the horizontal component of the earth's magnetic field is B₀, and the angle of dip is 60o. The intensity of earth's magnetic field at that place will be
Earth's magnetic field always has a horizontal component except at
Water level rises in a capilary tube, if the angle of contact is
A horizontal pipe line carries water in a streamline flow. At a point along the pipe where cross-sectional area is 10 cm2, the velocity of water is 1 m-s-1 and pressure is 2000 Pa. The pressure of water, at another point where cross-sectional area is 5 cm2, is (Density of water = 1000 kg-m-3)
A wire can be broken by applying a load of 200 N.The force required to break another wire of the same length and same material, but double in diameter, is
A particle starting from rest travels a distance x in first 2 seconds and a distance y in next two seconds, then
Before jumping in water from above a swimmer bends his body to
In the above problem, if the lift moves up with a constant velocity of 2 m/sec, the reading on the balance will be
The number of neutrons in a chain reaction increases in
In radioactive decay process, the negatively charged emitted β -particles are
The magnifying power of a telescope can be increased by increasing
A particle moves such that its acceleration a is given by a = -bx, where x is displacement from equilibrium position and b is a constant. The period of oscillation is
Find the kinetic energy of the photoelectrons emitted when light of wavelength 4000 Å is incident on a metal of work function 2 eV (find approximately)
A projectile is fired at 30o, momentum p. Neglecting friction, the change in kinetic energy when it returns to the ground will be
The maximum wavelength of radiation that can produce photoelectric effect in certain metal is 200 nm. The maximum kinetic energy acquired by electron due to radiation of wavelength 100 nm will be
A ray of light is incident on one of the refracting faces of an equilateral prism, at an angle of incidence 48o , in the minimum deviation position. The angle of deviation produced by the prism is
If the distance between a point source and screen is made one third, then intensity of light (I) and the initial intensity of light will be related as :
A convex lens has a focal length f. It is cut into two parts along a line perpendicular to principal axis. The focal length of each part will be
A man with defective eyes cannot see distinctly objects at distances more than 60 cm from his eyes. The power of the lens to be used will be
A Planet is moving around the sun in an elliptical orbit. Its speed is
Two simple harmonic motions are represented by y1 = 5 (sin 2πt + √3 cos 2πt), y2 = 5 sin 2πt + π ∕ 4
The ratio of the amplitudes of two SHM's is
A particle is in SHM of amplitude 2cm. At the extreme position, the force is 4N. The force on the particle at a point midway between mean and extreme positions is
In the forward bias arrangement of a p-n junction diode
p-type crystal of a p-n junction diode is connected to a positive terminal of battery and n-type crystal connected to negative terminal of battery
Two uniform wires are vibrating simultaneously in their fundamental modes. The tensions, lengths, diameters and the densities of the two wires are in the ratio's 8 : 1, 36 : 35, 4 : 1 and 1 : 2 respectively. If the note of the higher pitch has a frequency 360 Hz, the number of beats produced per second is
A capillary tube when immersed vertically in liquid records a rise of 3 cm. If the tube is immersed in the liquid at an angle of 60o with the vertical. The length of the liquid column along the tube is
If a power of 100 W is being supplied across a potential difference of 200 V, current flowing is
The amount of heat produced in a conductor, due to the flow of current, is directly proportional to
To deposit one gm equivalent of an element at an electrode, the quantity of electricity needed is
A long cylindrical vessel of volume 'v' and linear coefficient of expansion 'a' contains a liquid. The level of liquid has not changed on heating. The volume coefficient of real expansion of liquid is
A Carnot engine has an efficiency of 25%. If energy is fed into the engine at the rate of 1 kW, then the output of the engine is
Consider the following statements:
Assertion (A) : The internal energy of an ideal gas does not change during an isothermal process
Reason (R) : The decrease in volume of a gas is compensated by a corresponding increase in pressure when its temperature is held constant
Of these statements :
The length and breath of a metal sheet are 3.124 m and 3.002 m respectively. The area of this sheet up to four significant figures is
The maximum intensity in interference pattern is how many times the intensity due to each slit?
Tesla is the unit of
If wavelength of a photon is 6000 Å, then energy of this photon will be
If the amplitude of sound is doubled and the frequency reduced to one-fourth, the intensity of sound at the same point will be
A source of sound gives 5 beats per second when sounded with another source of frequency 100 Hz. The second harmonic of the source together with a source of frequency 205 hz gives 5 beats/second. What is the frequency of the source?
A machine which is 75% efficient, uses 12 joules of energy in lifting up a 1 kg mass through a certain distance. The mass is then allowed to fall through that distance. The velocity at the end of its fall is (in ms-1)
Which one of the following substances will decolourise alkaline KMnO4 solution?
Insecticide Gammexane is
In its reaction with silver nitrate acetylene shows
1-Butyne reacts with cold alkaline KMnO₄ to yield
In which of the following solvents, AgBr will have the highest solubility?
An electron is moving in Bohr's fourth orbit. Its de Broglie wavelength is λ. What is the circumference of the fourth orbit?
The correct set of quantum numbers for the unpaired electron of chlorine atom is
The probability of finding an electron residing in a px orbital is zero in the
Among the molecules (a)XeO₃ (b)XeOF (c)XeOF₆,those having same no. of lone pairs on Xe are
Number of sigma bonds in P₄O₁₀ is
In an adiabatic expansion of ideal gas,
The compound with carbon uses only its sp3 hybrid orbitals for bond formation is
Which one of the following informations can be obtained on the basis of Le Chatelier principle ?
Which of the following kinds of catalysis can be explained by the adsorption theory?
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
The standard enthalpy of decomposition of N₂O₄ to NO₂ is 58.04 KJ and standard entropy of this reaction is 176.7 J-K-1 The standard free energy change for this reaction at 25oC, is
The IUPAC name for CH₃CO-CH₃ is
Substances used in bringing down the body temperature in high fevers are called
Of the following, the one with largest size is
As the number of electrons in an atom decreases, the effective nuclear charge and attractive force on the outer electrons increases whereas if the number of electrons increases, the effective nuclear charge decreases.Thus, the cation with highest charge always possess smallest ionic size and anion with highest charge always possess largest ionic size.
The co-ordination no. of the central metal atom, in a complex compound is determined by the no. of ligands around the metal ion is bonded
Molar ionic conductivities of a bivalent electrolyte are 57 and 73.The molar conductivity of the solution will be
The least stable oxide at room temperature is
3.2 oxygen is diffused in 10 minutes. In similar conditions, 2.8 g nitrogen will diffuse in
The total pressure exerted by a number of non-reacting gases is equal to the sum of the partial pressure of the gases under the same conditions is known as
A solution of sodium metal in liquid ammonia is strongly reducing due to the presence of
Which variety of glass is used for manufacture of optical glasses?
AlCl₃ fumes in moist air because
Cassiterite is an ore of
The basic character of hydrides of the 15 group elements decreases in the order
Which statement about H₂S is false ?
HI cannot be prepared by the action of conc. H₂SO₄ on KI because
The name of CaSO₄.1/2H₂O is
On industrial scale, H₂O₂ is now generally prepared by
Aqueous solution of acetic acid contains
Which will not effect the degree of ionisation ?
Which of the following is acidic in nature?
C7H8O show how many isomers?
Which of the following has the maximum acidic strength?
C-14 has a half life of 5760 years. 100 mg of sample containing C-14 is reduced to 25 mg in
Which of the following is the strongest acid?
-Wooden artifact and freshly cut tree are disintegrated at a rate of 7.6 and 15.2 min-1g-1 of carbon (t₁/t2=5760 years) respectively. The age of the artifact is
In SN1 (Substitution, nucleophilic unimolecular) reaction, the racemization takes place. It is due to
Reaction of ethyl formate with excess of CH₃MgI followed by hydrolysis gives
Which of the following is correct?
One mole of complex compound Co(NH₃)₅ Cl₃ gives 3 mol of ions on dissolution in water. One mol of same complex reacts with two mol of AgNO₃ solution to form two mol of AgCl(s). The struture of complex is
A sample of 0.2 g of a diacidic base is required for the neutralisation of 25 ml of N/8 HCl. The molecular weight of the base is
In the following, electrophile is:
HO ― NO2
Conc. HNO3 forms NO2+ in presence of :
The polymer which has amide linkage is
Which of the following statements is correct?
A reducing agent is a substance which can
Oxidation number of O in H₂O₂ will be
A 1% aqueous solution (mass by volume) of a certain substance is isotonic with a 3% solution of dextrose, i.e. glucose (molar mass 180) at a given temperature. The molar mass of the substance is
10 ml. of N-HCl, 20 ml of N/2 H₂SO₄ and 30 ml of N/3 HNO₃ are mixed together and volume made to one litre. The normality of the resulting solution is
In a metal 'M' having BCC arrangement, edge length of the unit cell is 400 pm. The atomic radius of M is
Which of the following can exhibit optical isomerism?
4 g of copper was dissolved in concentrated nitric acid. The copper nitrate solution on strong heating, gives 5g of its oxide. The equivalent weight copper is
The ion that is likely to be colourless in aqueous solution is
The black compound formed during the reaction between sodium thiosulphate and silver nitrate is
When a strong beam of light is passed through a colloidal solution, the light will
Use the following information to answer the question. 1. Systole of the ventricles. 2. Opening of the atrio-ventricular valves. 3. Electricalimpulse sent from the SA node. 4. Atria fill with blood. The order in which the events above occur during one heartbeat (the cardiac cycle) is
Mouth part present in female Anopheles but absent in male is
Which area has the greatest amount of enzyme activity?
In cell division, cell plate is formed during
The enzymatic breakdown of any type of food molecule is called ________.
Which cell has no nucleus when it is mature?
Red blood cells survive around _____ days.
In coelenterates,the mouth of medusa is located on:
Sporeine is a/an
One of the following is native to West Asia
The "chicory powder" which is mixed with coffee powder is obtained from
One of the following is a plant of great medicinal value
Cardamoms are ripe dried fruits of
Which of the following species of silkworm are found in India?
TSH stands for
The ecosystem of a pond is referred as
Mr X is eating curd/yoghurt. For this he is occupying trophic level
Pyramid of energy (in a forest ecosystem) is
Hormone which helps in implantation of embryo in uterus is
DNA and RNA are different molecules
Which of the following is a saprophytic angiosperm ?
Fatty liver syndrome is due to
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 :
The term independent assortment means
The contrasting pairs of factors in Mendelian crosses are called
Gynecomastia is found in
Which of the following is not an area that contains lymph nodes?
Membranous labyrinth is concerned with
The walls of lymphatic vessels are similar to those of cardiovascular
Snakes do not have
The vestibular apparatus consists of the
Bat can travel
The percentage of light energy utilised for photosynthesis by higher plants is
The kingdoms-monera, protista, fungi, plantae and animalia are distinguished on the basis of
An essential element is that which
Translocation of carbohydrate nutrients usually occurs in the form of
Father of pearl industry is
Which of the following is an example of biotic resource of energy?
Effect of daily light period on flowering is
Spraying of DDT on crops causes pollution of
Which one of the following substances plays an important role in biochemical defence of host plants?
Which of the following organism is useful in the preparation of roquefort cheese?
In which one of the following pathogens do the cells of promycelium after the germination of teleutospore produce infection hyphae instead of basidiospores?
Abscisic acid controls
Stigmas are large and sticky in case of
In flowering plants archesporium gives rise to
National Environmental Planning Engineering Organisation at Nagpur is
Spicules are found in
In mammals, primitive streak gives rise to
Maximum energy becomes available per mole of glucose when it is metabolised through
Typhlosole of Earthworm is a device for
There is a stem modification in Ruscus. It is
In Frog, jelly around the eggs is deposited
R.Q. of 4 is obtained when respiratory substrate is
In what form is most of the carbon dioxide (CO2) transported in the blood?
The destruction of the cilia lining the respiratory tract would result in
Sunken stomata are found in
Which of the following causes the release of aldosterone?
Low blood volume will result in