An A.C. supply gives 30 V r.m.s. which passes through a 10Ω resistance. The power dissipated in it is
In the photo electric phenomenon, the number of photo electrons emitted is proportional to
A proton and an α - particle enter into a region of uniform electric field. The ratio of the force on proton to that on α - particle is
An electron and a proton have same de-Broglie's wavelength. The kinetic energy of an electron is
The angular speed of an engine wheel making 90 revolutions per minute is
Number of revolution n=90 per minute . one revolution=2 π ; ∴ angular displacement=90 × 2π ; Angular velocity=angular displacement / time ; Angular velocity=90 × 2π / 60 Angular velocity=3 × π rad/ sec
A cell of internal resistance 1.5Ω and of e.m.f. 1.5 volt balances 500 cm on a potentiometer wire. If a wire of 1.5 Ω is connected between the balance point and the cell, then the balance point will shift
Three resistances of one ohm each are connected in parallel. Such connection is again connected with 2/3Ω resistor in series. The resultant resistance will be
Light of wavelength 5000 Å is incident on a metal, whose work-function is 2 eV. The maximum kinetic energy of the photoelectrons would be
From photoelectric equation = hc/λ = w0 + 1/2 mv2
1/2 mv2 = hc/λ - w0
The maximum wavelength of a beam of light can be used to produce photo electric effect on a metal is 250 nm. The energy of the electrons in Joule emitted from the surface of the metal when a beam of light of wavelength 200 nm is used [h = 6.6 x 10 − 34 J − sec ; c = 3 x 10 8 ms − 1 ]
When λ is expressed in A° then, W = 12400/λ
W = 1240/250 = 4.96eV
h υ = 1240/200 = 6.20eV
K = 6.20 - 4.96 = 1.24eV
= 1.24 x 1.6 x 10-19
= 19.84 x 1.6 x 10-20 J ≅ 19.86 x 10 − 20
If particles are moving with same velocity, then maximum de-Broglie wavelength will be for
A coil of n turns and resistance R is connected with a galvanometer of resistance 4 R.. This combination is moved in time t seconds from a magentic flux φ₁ to φ₂. The induced current in the circuit is
The energy of a photon of wavelength λ is given
Which one of the following electromagnetic radiations have the smallest wavelength?
Infra-red radiations are detected by
Sixty four identical drops each charged by q coulomb to potential V volt coalesce to form a single large drop. The charge and potential on the large drop are respectively
An electric dipole has the magnitude of its charge as q, and its dipole moment is p. It is placed in a uniform electric field E. If its dipole moment is along the direction of the field, then force acting on it and its potential energy are respectively
The situation is shown in adjacent figure,
∴ U = - pE cos 0 = - pE = Minimum
and the net force on the dipole is zero
A mass M is split into two parts, m and M-m, which are then separated by a certain distance. What ratio of m/M maximizes the gravitational force between the two parts
In a closed room, heat transfer takes place by
If a piston is pushed rapidly into a container of gas, what will happen to the kinetic energy of the molecules of gas and to the temperature of the gas
A mass m falls freely from rest. The linear momentum, after it has fallen through height h, is
u = 0; since it falls freely from rest
v2 - u2 = 2gh;
v2 = 2gh
The linear momentum is given by
p = mv = m
A cyclotron oscillator frequency is 10 MHz. If radius of its dees 60 cm, then magnetic field for accelerating the protons is (Given e = 1.6 x 10-19C, mp = 1.67 x 10-27 kg)
v = 10 MHz = 10 x106 Hz = 107 Hz
R = rm = 60 cm = 0.6 m
e = 1.6 x 10-19 C
m = 1.67 x 10-27 kg
A magnet freely suspended in a vibration magnetometer makes 40 oscillations per minute at a place 'A' and 20 oscillations per minute at a place 'B'. If the horizontal component of earth's magnetic field at 'A' is 36 x 10 − 6 T, then its value at 'B' is
Air is streaming over both the aeroplane wings such that its speed is 85 m-s⁻1 over the upper surface and 75 m-s⁻1 at the lower surface. If the wings are 10 m long and have an average width of 2 m, then lift of the wind on aeroplane is (Take density of air = 1.5 kg-m⁻1)
A wire of length L and cross-section A is made of material of Young's modulus Y. If it is stretched by an amount x, then work done is
The magnetic field strength at a point at a distance 'd' from the centre, on the axial line of a very short bar magnet of magnetic moment 'M' is B. The magnetic induction at a distance'2d' from centre on the equatorial line of a magnet of moment 8M, will be
When the nucleus of a radioactive element emits an alpha particle, the atomic number is decreases by
During the β -decay,
In a Rutherford scattering experiment when a projectile of charge z1 and mass M1 approaches a target nucleus of charge z2 and mass M2, the distance of closest approach is r0. The energy of the projectile is:
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
If the moment of inertia of a wheel, having radius of gyration 60 cm, is 360 kg-m2, then mass of the wheel is
A particle is viberating in a simple harmonic motion with an amplitude of 4 cm. At what displacement from the equilibrium position, is its energy half potential and kinetic ?
Which of the following forms a perfect image free from all aberrations?
When a sphere of moment of inertia I about an axis through its centre of gravity and mass m rolls down from rest, on an inclined plane without slipping, its kinetic energy is
The time period of a simple pendulum is 2sec. If its length is increased by four times period becomes
When aluminium is added as an impurity to silicon, then resulting material is
Heat given to a body which rises its temperature by 1°C 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
Suitable impurities are added to a semiconductor depending on its use. This is done to
An ideal gas is made to go through a cyclic thermodynamical process in four steps. The amount of heat involved are Q1 = 600 J, Q2 = -400 J, Q3 = -300 J and Q4 = 200 J respectively. The corresponding work involved are W1 = 300 J, W2 = -200 J, W3 = -150 J and W4. What is the value of W4?
Whose dimensions is ML2T⁻1
A standing wave having 3 nodes and 2 antinodes is formed between two atoms having a distance 1.21 Å between them. The wavelength of the standing wave is
In a sinusoidal wave, the time required for a particular point to move from maximum displacement is 0.5 s. The frequency of wave is
If K.E. of a body becomes four times of initial value, then new momentum will
Two identical blocks A and B each of mass 'm' resting on smooth floor are connected by a light spring of natural length L and spring constant K, with the spring at its natural length. A third identical block C moving with a speed ν along the line joining A and B collides with A. the maximum compression in the spring is
An electric motor exerts a force of 40 N on a cable and pulls it through a distance of 30m in one minute. The power supplied by the motor in watts is
The product of the following reaction is
Which of the following does not turn Schiff's reagent to pink ?
According to Bohr's theory, the angular momentum of an electron is 5th orbit is
The electronic configuration of an atom/ion can be defined by the following :
The alkyl halide is converted into ethyl alcohol by
A nucleotide consists of
Rancidity of butter is due to the formation of
Homolytic fission of C - C bond in ethane (CH₃ - CH₃) gives an intermediate in which carbon atom is
Which of the following hydrogen halide has the most polar bond?
If a reaction involves only solids and liquids,Which of the following is true ?
For an ideal gas the relationship between internal energy change .(∆E) and enthalpy change(∆H)is
Pick out the correct statement __
The rate constant of first order reaction whose half life is 480 sec is
In which of the following neutralization reaction, the heat of neutralisation will be highest?
Which of the following statement is true for ∆G?
One of the most widely used drug in medicine iodex in
Tautomerism is exhibited by
Ligand in a complex salt are
Which one of the following complexes is an outer orbital complex?
All octahedral complexes of Ni2+ are outer orbital complexes. The electronic configuration of Ni2+ ion (3d8) indicates that two inner d-orbitals can not be made available to allow d2sp3 hybridisation.
The amount of chlorine evolved, when 2 A of current is passed for 30 minutes in an aqueous solution of NaCl will be
Chlorine cannot displace
The unit of equivalent conductivity is
If 1 m3 of a solution of an electrolyte placed between two large electrodes 1m apart. The cross-sectional area of the solution will be 1m2.
→ The conductance of solution will evidently be its specific conductance because we have a one-meter cube of the solution.
→ If 1m3 of the solution contains 1 gram equivalent of the electrolyte.
→ As unit of Specific conductance is Sm−1
or Scm−1,so the unit of Equivalent Conductance is
or ohm cm−1
Which of the following is a solid-pollutant?
White enamel of our teeth is
The difference of water molecules in gypsum and plaster of paris is
At higher altitude the boiling point of water lowers because
The gas molecules have rms velocity of its molecules as 100 m/s. What is its average velocity ?
A pseudo solid is
Bad conductor of electricity is
Which of the following salts undergoes anionic hydrolysis?
BF₃ is an acid according to
Which is most basic ?
Maximum hyperconjugation is observed in :
following step is :
Plexiglass (PMMA) is a polymer of
The best method to separate the mixture of ortho and para nitrophenol (1:1) is
For which of the following compounds Lassaigne's test of nitrogen will fail?
Which of the following is used for the destruction of colloids?
The oxidation number of carbon in CH₂O is
Identify the mixture that shows positive deviations from Raoult's law
If 20ml of 0.4 N NaOH solution completely neutralise 40ml of a dibasic acid, the molarity of the acid solution
How much of NaOH is required to neutralize 1500 cm3 of 0.1 N HCl?
The number of moles of KMnO₄ that will be needed to react completely with one mole of ferrous oxalate in acidic solution is
Compound that is both paramagnetic and coloured is
A component of xylem is
In prophase, the chromosomes condense and become shorter and thicker due to
Chromosomes become shorter and thicker by coiling themselves (condensation) This prevents tangling with other chromosomes.
Smooth endoplasmic reticulum synthesises
A bivalent consists of
The latest model for plasma membrane is
All tailed bacteriophagic cells contain
The female sex organs, in bryophytes are called
Erythroblastosis foetalis, also known as hemolytic disease of the newborn, most often occurs in ______________ mothers carrying ______________ fetuses.
Water makes up what % of the plasma?
If BB represents barr body and Y₀ Y-body, XXY or Klinefelters syndrome has
Twenty third pair of human chromosomes are known as
Which blood components transport most of the gases?
Which of these factors will increase the RBC or RCC?
Each of the following statements about Brunner's glands is correct except:
Human population follows :
Upper part of Sea/aquatic ecosystem contains
Amniocentesis is a process to :
The presence of large numbers of mitochondria in the cells lining the small intestine allows it to
Function of ACTH is to
Which of the following disease results from endocrine disorder ?
The part of the earth and atmosphere supporting life is
Feedback inhibition of enzyme is influenced by
Which of the following was the transitional stage between apes and humans?
The vestibular apparatus consists of the
Two individuals with similar external appearance but different genetic make up have the similar
Frequency of a perfect heterozygous cross between AABBCC x AaBbCc is
Vessels are found in
How much time is generally required / taken by the pine plant from pollination to fertilization-
Polymorphism is mainly due to
Binding of antigen to antibody is through
Glycoproteins formed in response to viral infections are
AIDS is caused by
Zoochlorellae and Zooxanthallae present in Hydra are
A gregarious but nonsocial animal is
Which immunoglobin is the largest in size
Respiratory enzymes of aerobic bacteria are mainly located in
Which of the following is a micro-nutrient or a trace element
Sexual reproduction does not occur in
Most of the plants obtain nitrogen from the soil in the form of
In which of the following afflatoxin was first discovered ?
Minerals are absorbed in the form of
In Cockroach enzyme cellulase is produced by
In cockroach, the structure which is not associated with mouthparts is
The largest flower in the world is that of
Chloragogen cells of Earthworm take part in
In Pheretima, septa are absent between which segments?
Identify the correctly matched pair of leaf
In mammals, corpus callosum connects
Piliferous layer is of
Least porous soil is
Physical and chemical conditions of soil are studied under
Collenchyma is made up of
Agriculture was originated in mesolithic age about
Kadiri-1 and Kadiri-2 are the varieties of
Electrically induced vibrations in the crystals of lead zirconate are utilised in the
Pasteurisation is a process that is undertaken to
At present, the Dipnoans are distributed over :
The application of engineering and technological principles to the life sciences is called
All steroids have the same core structure that consists of
Bicollateral bundles occur in the stem of
Monoclonal antibodies are produced by
Rod-shaped elongated thick-walled lignified dead cells found in seed coat of pulses (legumes) are
Monoclonal antibodies are
Spiral cleavage is observed in
The most important source of soil pollution of soil is
A storage protein is
The sum total of the populations of the same kind of organisms constitute
Entry of sewage in water caused a spurt in the growth of algae but killed fish due to
The primary succession refers to the development of communities on a
The most common type of embryo sac is
Testosterone in the adult male is produced by the
Lever mechanism or turn pipe mechanism of pollination is found in
The edible part of cauliflower is
Low levels of estrogen and progesterone in the blood will result in
The male homologue of the female clitoris is the
Famous publication "Species Plantarum" was written by-
When sperm is ejaculated, it comes into contact with or passes near each of the following structures. Which sequence correctly describes the passage of sperm out of the body?
The process that moves glucose from the proximal convoluted tubule into the peritubular capillaries is