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Consider the following statements (A) and (B) and identify the correct answer.
Statement I (A): A zener diode is connected in reverse bias, when used as a voltage regulator.
Statement I (B): The potential barrier of p-n junction lies between 0.1 V to 0.3 V.
According to Newton, the viscous force acting between liquid layers of area A and velocity gradient Δv/Δz is given by where η is constant called coefficient of viscosity. The dimensional formula of η is:
The size of the image of an object, which is at infinity, as formed by a convex lens of focal length 30 cm is 2 cm. If a concave lens of focal length 20 cm is placed between the convex lens and image at a distance of 26 cm from the convex lens, calculate the new size of the image.
The potential energy of a particle varies as For 0≤ x ≤ 1, the de-Broglie wavelength is λ1 and for x > 1 the de-Broglie wavelength is λ2. The total energy of the particle is 2E0. Find λ1/λ2
A car is moving in a circular horizontal track of radius 10 m with a constant speed of 10 m s−1. A plumb bob is suspended from the roof of the car by a light rigid rod. The angle made by the rod with the vertical is (Take g=10 m s−2)
On seeing a traffic signal 400 m ahead, a driver applied brakes to his vehicle. At the time of applying brakes, the vehicle was moving at the rate of 15 ms-1 and started retarding at the rate of 0.3 ms-2. The distance of the vehicle from the traffic signal after one minute was
Two satellites of Earth, S1 and S2, are moving in the same orbit. The mass of S1 is four times the mass of S2. Which of the following statements is true?
The time period of an earth satellite in circular orbit is independent of
A particle is fired with velocity u making angle θ with the horizontal. What is the magnitude of change in velocity when it is at the highest point?
A black body of temperature T is inside a chamber of temperature T0. Now the closed chamber is slightly opened to the sun such that the temperature of black body (T) and chamber (T0) remains constant. Then,
A stone tied to a string of length L is whirled in a vertical circle with the other end of the string at the centre. At a certain instant of time, the stone is at its lowest position, and has a speed u. The magnitude of the change in its velocity as it reaches a position, where the string is horizontal, is
Following graph is showing the variation of potential energy between a pair of nucleons as a function of their separation. Indicate the regions A and B.
Two nucleons are at a separation of one Fermi. Protons have a charge of +1.6 × 10−19C. The net nuclear force between them is F1, if both are neutrons, F2, if both are protons F3, if one is proton and the other is neutron, Then:
An electric dipole of dipole moment 4×10−5 Cm is placed in a uniform electric field of 10−3 NC−1 making an angle of 30° with the direction of field.
Determine the torque exerted by the electric field on the dipole.
The variation of velocity (in m/s) with time (in s) of a particle going along a straight line is shown in the figure. Calculate the distance traversed in 4 seconds.
If the molecular weight of two gases are M1 and M2, then at a temperature the ratio of RMS velocity c1 and c2 will be
The change in internal energy of a thermodynamical system which has absorbed 5000 cal of heat and does 5000 J of work is
Three moles of nitrogen is mixed with six moles of helium. The effective molar specific heat of the mixture at constant volume is
In the following question, two statements are given. One is assertion and the other is reason. Examine the statements carefully and mark the correct option.
Assertion (A): Kinetic energy is zero to move a positive test charge from infinity to the particular point against the electrostatic force due to the electric field.
Reason (R): Kinetic energy is directly proportional to the mass, that's why kinetic energy is zero for test charge.
A vessel has 10 g of hydrogen gas at pressure P and temperature 400 K. A small hole is made in it so that hydrogen leaks out. How much hydrogen leaks out if the final pressure becomes half and temperature becomes 3/4th of its previous value?
If three molecules of oxygen at 27ºC have velocities 0.5 km/s, 1 km/s and 2 km/s respectively. Then their root mean square speed will be
Temperature versus pressure graph of an ideal gas is shown in the figure. If density of gas at point P is then density of gas at point Q will be
For a rigid diatomic molecules, molar specific heat at constant pressure is given by CP = R/x, where R is universal gas constant and x is number value. Then 3.5x will be
Which of the following is not an assumption of kinetic theory of gases?
Which of the following law of thermodynamics forms the basis for the definition of temperature?
Which of the following diagram represent the isometric process correctly?
Assertion (A): Classical Physics mainly includes subjects like Mechanics, Electrodynamics, Optics and Thermodynamics.
Reason (R): The macroscopic domain includes phenomena at the laboratory, terrestrial and astronomical scales.
The work done by the system in the cyclic process as shown in figure is
A cyclic process for one mole of an ideal gas is shown in the V–T diagram. The work done by the gas in AB, BC and CA respectively are
A box of negligible mass containing n moles of an ideal gas of molar mass M and adiabatic exponent moves with constant speed v on a smooth horizontal surface. If box suddenly stops, then change in temperature of gas will be
If CP and CV denoted the specific heat of unit gram mass of nitrogen at constant pressure and volume respectively, then (R is universal gas constant)
At what temperature the root mean square speed of molecules of a gas is twice of its root mean square speed at 27ºC?
The mean free path of molecules of a gas, of diameter d is inversely proportional to
P-T diagram is shown in given figure. Which of the following graph correctly represents the corresponding V-T diagram?
Match the Column I with Column II.
Given below are two statements
Statement I: Biot-Savart’s law gives us the expression for the magnetic field strength of an infinitesimal current element (Idl) of a current carrying conductor only.
Statement II: Biot-Savart’s law is analogous to Coulomb’s inverse square law of charge q, with the former being related to the field produced by a scalar source, Idl while the latter being produced by a vector source, q. In light of above statements choose the most appropriate answer from the options given below
An RLC series circuit is driven by a sinusoidal emf with angular frequency ⍵ If ⍵ is increased without changing the amplitude of the emf, the current amplitude increases. If the inductance is L, the capacitance is C and the resistance R, it implies:
Two photons of energies twice and thrice the work function of a metal are incident on the metal surface. The ratio of maximum velocities of the photoelectrons emitted in the two cases, respectively, is
The mass of an oxygen molecule is about 16 times that of a hydrogen molecule. At room temperature, the rms speed of the oxygen molecules is vo. The rms speed of the hydrogen molecules at the same temperature will be
The work function of a substance is 4.0 eV. The longest wavelength of light that can cause photoelectron emission from this substance is approximately
Assertion: Parallex method cannot be used for measuring distances of stars more than 100 light years away.
Reason: Because parallex angle reduces so much that it cannot be measured accurately.
Solar radiation is an example of
If a spring extends by xx on loading then the energy stored in the spring is (if T is the tension and kk is the force constant of the of the spring).
A tuning fork of frequency 512 Hz is used to produce vibrations in a sonometer wire of natural frequency 256 Hz. The wire will vibrate in
Given that the abundance of isotopes 54Fe, 56Fe and 57Fe are 5 %, 90 % and 5 % respectively, what is the atomic mass of Fe?
Which of the following is a redox reaction?
When 25 g of a non-volatile solute is dissolved in 100 g of water, the vapour pressure is lowered by 2.25 × 10-1 mm of Hg. If the vapour pressure of water at 20oC is 17.5 mm of Hg, what is the molecular weight of the solute?
The wavelength associated with a golf ball weighing 200g and moving at a speed of 5m/h is of the order:
on mercuration-demercuration produces the major product :
Which of the following acts as an oxidizing as well as reducing agent?
In the dichromate dianion
In a saturated solution of the sparingly soluble electrolyte AgIO3 (molecular mass = 283), the equilibrium which sets in is AgIO3 (s) ⇌ Ag+ (aq)+IO−3 (aq).
If the solubility product constant Ksp of AgIO3 at a given temperature is 1.0 × 10−8, what is the mass of AgIO3 in 100 mL of its saturated solution?
The correct order of increasing oxidising power is
Which of the following graphs represents Henry’s law? (Where x = mole fraction of dissolved gas, KH = 2000 kbar)
Resistance of a 0.1 M KCI solution in a conductance cell is 200 ohm and conductivity is 0.015 S cm-1. The value of cell constant is
Which of the following is a zero order reaction?
(Reactant NH3 is strongly adsorbed)
How many half lives are required to complete 93.75% of a first order reaction?
If the rate of reaction becomes double when temperature is increased from 25°C to 35°C, then activation energy of the reaction (in kJ) will be
Half life of a chemical reaction at a particular concentration is 75 min. When the concentration of the reactant is doubled, the half life becomes 150 min. What is the order of reaction?
In the following question, a statement of Assertion (A) followed by a statement of Reason (R) is given.
Choose the correct option out of the choices given below each question.
Assertion (A): Sodium chloride formed by the action of chlorine gas on sodium metal is a stable compound.
Reason (R): This is because sodium and chloride ions acquire octet in sodium chloride formation.
Statement A: The elements Z = 117 belongs to chalcogen family and the electronic configuration would be [Rn] 5f146d107s27p4.
Statement B: The element with Z = 120 belongs to Group 2 (alkaline earth metals), and the electronic configuration would be [Uuo]8s2
At 300 K and 1 atmospheric pressure, 10 mL of a hydrocarbon required 55 mL of O2 for complete combustion, and 40 mL of CO2 is formed. The formula of the hydrocarbon is:
The sulphur in 1.0 g sample of steel is burned to sulphur dioxide and absorbed in 50.0 mL of 0.1 M sodium hydroxide solution. The excess sodium hydroxide requires 24.0 mL of 0.15 M hydrochloric acid solution. The percentage of sulphur in the sample is
Upon burning, 25 g of an unknown hydrocarbon produces 88 g of CO2 and 9 g of H2O. This unknown hydrocarbon contains
When 10 g of 90% pure limestone is heated completely, the volume (in litres) of CO2 liberated at STP will be
In the following question, two statements are given. One is assertion and the other is reason. Examine the statements carefully and mark the correct answer according to the instructions given below.
Assertion: Equal moles of different substances contain same number of constituent particles.
Reason: Equal weights of different substances contain same number of constituent particles.
The weight of iron which will be converted into its oxide (Fe3O4) by the action of 18 g of steam on it, will be (Atomic weight of Fe = 56)
The stoichiometry of the reaction given below is
K2S2O8(aq) + 2KI(aq) → 2K2SO4(aq) + I2(aq)
1 litre of a mixture of CO and CO2 is passed over white hot coke. If the resultant gas mixture is measured 1.4 litres at the same temperature and pressure, the volume ratio of CO : CO2 in the original mixture is
Density of water at room temperature is 1.0 gml-1. How many molecules are there in one drop of water if its volume is 0.05 ml?
Which of the following elements is a metalloid?
Which of the following statements is correct?
Which of the following series of elements is correct in terms of increasing atomic radii?
Which of the following sets has the same number of unpaired electrons in their ground state?
Which of the following is the electronic configuration of a noble gas?
The atomic numbers of vanadium (V), chromium (Cr), iron (Fe) and cobalt (Co) are 23, 24, 26 and 27, respectively. Which one of these may be expected to have the highest second ionisation enthalpy?
Choose the process by which liquid hydrocarbons can be converted to gaseous hydrocarbons.
On heating sodium propionate with sodium hydroxide and quicklime, the gas evolved is:
Aqueous solution of which of the following compounds is electrolysed, when acetylene gas is obtained?
+I effect is shown by
In the case of homologous series of alkanes, which one of the following statements is incorrect?
Which one of the following is not a greenhouse gas?
Which of the following configurations, forms an outer octahedral complex only ?
Match the reagents which react with RCOOH in column I with their corresponding major products in column II and choose the correct combination from the options.
Which of the following is not a homologous series?
C6H6 is very good industrial solvent for:
Which of the following is/are saturated hydrocarbon?
Which of the following is not a saturated hydrocarbon?
The shape of NH3 molecule is
Among the following statements which is/are correct?
1. Plants convert energy from sunlight into food stored as carbohydrates
2. Plants have chlorophyll
3. Plant cells do not have cell walls
Match the following types of vegetations with their forest zones and select the correct option.
'Antiparallel strands' of a DNA molecule means tha
An obligate parasite is one which
Newly formed Biosphere Reserve of India (2011) is:
Which of the following statements are INCORRECT?
1. Geitonogamy is the pollination of a flower by the pollen from another flower of the same plant.
2. Interfascicular cambium is developed from the cells of medullary ray.
3. Age of a tree can be estimated by diameter of its bark.
4. Lenticels are involved in transpiration
In a plant, red fruit (R) is dominant over yellow fruit (r), and tallness (T) is dominant over shortness (t). A plant with RRTT genotype is crossed with a plant that is rrtt. Then in F1 generation,
A lake with an inflow of domestic sewage rich in organic waste may result in
Read the following statements carefully.
a. The most vital event of sexual reproduction is syngamy.
b. Zygote is a vital link that ensures continuity of species between organisms of one generation and the next.
c. In angiosperms, pollen grains are the carriers of motile male gametes.
d. Ovary wall proliferates to form pericarp after fertilization.
Correct statements are
Megaspore mother cell differentiates from
Proportion of recombinant phenotypes in F2 offsprings of Mendelian dihybrid cross is
An E. coli having a heavy DNA molecule labelled with 15N is allowed to grow in a medium with normal 14NH4CI. Which of the following is correct for DNA molecules that were extracted from the culture after 40 minutes?
An E. coli cell with a mutated lac-z gene, due to which it is unable to synthesise the corresponding enzyme, is still growing in the nutrient medium. It indicates that medium is supplemented with energy source/enzyme
What type of viruses are produced after the death of E. coli, if a T2 phage having radioactive sulfur infects bacteria growing on normal nutrient medium?
How many types of RNA polymerases are required for transcription of different r-RNAs present In 80S type ribosomes?
Mark the odd one w.r.t. Mendel’s laws of inheritance.
In the following questions a statement of Assertion (A) is followed by a statement of reason (R). Mark the correct choice as:
Assertion: Protozoans have physiological division of labour.
Reason: They have a well-developed cell, tissue and tissue organ system.
Which is the first hierarchical category that makes Datura, petunia and potato distinguishable from each other?
The outer whorl is called the ________ and consists of the sepals.
In which of the following taxon, are dogs and cats grouped together?
'Systema Naturae' by Carl Linnaeus was about?
Which of the following is a fungus?
Which of the following statements is wrong?
All prokaryotes are simple, unicellular organisms. Which of the following are prokaryotes?
a. Bacteria
b. Blue-green algae
c. Fungi d. Protozoa
Specialised cells, called heterocysts, are borne by
Which of the following is the common feature amongst all eukaryotes?
The swollen bottom part of the carpel of a flower is called as ________.
Ribosomes are sites for
In Funaria, stomata are present on the:
The scientist(s) who gave artificial system of classification is/are:
Which stage of a plant’s growth is represented by the roots and shoot apex?
Which of the following genera consists of parasitic algae?
Angiosperms are similar to gymnosperms with respect to:
The number of mother cells required to produce 100 pollen grains is:
The phase during which homologous chromosomes come together to form a pair is:
The number of strands visible in the chromosomes at pachytene stage is:
During mitosis in plant cells, spindle fibers originate from:
When a cell is treated with 0.1 % colchicine during cell division then:
How many sub-stages are present in the prophase I of meiosis I?
Daughter cells produced as a result of meiosis have:
How many times does DNA replication take place during cell cycle?
During which of the following stages of cell division is the synaptonemal complex is formed?
Which of the following is the site of photolysis of water?
Which metabolic pathway is common to both fermentation, a type of anaerobic respiration, and aerobic respiration?
Assertion: The external factors that affect photosynthesis are number, size, age and orientation of leaves, mesophyll cells and chloroplasts and the amount of chlorophyll.
Reason: The internal factors that affect photosynthesis are availability of sunlight, temperature, CO2 concentration and water.
Which of the following functions is/are performed by the cnidoblasts present on the tentacles of a coelenterate?
Which of the following statements does not characterise an ecosystem?
Which of the following form(s) a synapse?
Match the following:
The vertebral column extends from the base of the skull and constitutes the main framework of the trunk. Which of the following is/are not the function(s) of the vertebral column?
a. It helps in the articulation of the upper and the lower limbs with the axial skeleton.
b. It serves as a point of attachment for ribs and musculature of the back.
c. It protects the spinal cord and supports the head.
The process of a muscle contracting is a complex process. Which of the following statements does not characterise muscle contraction in humans?
In which of the following phase(s) of formation of spermatids, the sperm mother cells lining the seminiferous tubules of the testes proliferate by repeated mitotic divisions and increase their number?
a. Multiplication phase
b. Growth phase
c. Maturation phase
Read the statements A and B and identify the correct choice from those given.
Statement A: Women are at the peak of conception on the 14th day of menstrual cycle.
Statement B: Vasectomy is the method normally employed to avoid conception in females.
Which of the following statements is/are false?
a. The expansion of diaphragm decreases the volume of thoracic chamber in the antero-posterior axis.
b. On an average, 1100 mL to 1200 mL volume of air remains in the lungs even after a forcible expiration.
c. Humans can increase the strength of breathing with the help of additional muscles in the abdomen.
Which of the following organelles is/are expected to be present more in cardiac cells?
Study of history of life forms on earth is called
Choose the incorrect statement.
The chronological order of human evolution from first human – like being the hominid is possibly
Which of the following is/are key concept(s) of Darwinian theory of evolution?
In the following question, the Assertions (A) and Reason (R) have been put forward. Read both the statements and choose the correct option from the following.
Assertion: Cardiac muscles is a type of voluntary muscles found in heart.
Reason: Cardiac muscles work with out resting under the will of animal.
Which one of the following group of animals is bilaterally symmetrical and triploblastic?
Which of the following animal phyla does not possess a coelom?
Which of the following features is not present in the phylum Arthropoda?
Water vascular system is the characteristic of which group among the following:
A jawless fish, which lays eggs in freshwater and whose ammocoetes larvae after metamorphosis return to the ocean is:
Which of the following mostly shows sexual dimorphism?
Which among the following organism has mammary glands for the production of milk to nourish their young ones?
Which of the following phyla includes diploblastic, aquatic animals with tissue grade of organization?
An epithelial tissue which is made of a single thin layer of flattened cells with irregular boundaries is found to be present at
Which of the following are immigrant cells of the areolar tissue?
Nails, hooves and horns are derived from:
The contraction of which muscle is involuntary, vigorous and rhythmic?
Which of the following is not a function of ground tissue?
Which of the following is a transparent tissue?
In which of the following forms is the maximum amount of CO2 carried in the blood?
Which of the following helps in sound production and is also called sound box?
Which of the following is a thin cartilaginous flap that covers the glottis during swallowing of food?
Which of the following give rise to respiratory bronchioles?
Among other organs, the thoracic chamber protects and holds the heart and lungs. Which of the following form(s) the thoracic chamber ventrally?
Which of the following is the inspiratory capacity (IC) of lungs?
Read the following statements A, B and choose the correct answer.
Statement-A: Any population has built in variation in characteristics.
Statement-B: According to Darwin, the fitness refers ultimately and only to reproductive fitness.
Match the columns and select the correct option.
Assertion: Cartilage and bone are rigid connective tissue.
Reason: Blood is connective tissue with fluid matrix.
Which function is performed by 3'-5' exonuclease active site of DNA pol I?
Which of the following is also known as enteric fever?
Which of the following can be introduced by bacterial vaccines?
If for some reason, the vasa efferentia in the human reproductive system get blocked, the gametes will not be transported from:
Which of the following set has the same number of chromosomes?
Which of the following has the greatest average value for respiratory volume and capacity?
What protect(s) the moist membranes of the respiratory tract?
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where η is constant called coefficient of viscosity. The dimensional formula of η is:
For 0≤ x ≤ 1, the de-Broglie wavelength is λ1 and for x > 1 the de-Broglie wavelength is λ2. The total energy of the particle is 2E0. Find λ1/λ2
on mercuration-demercuration produces the major product :
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