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For a rope of yield strength Sy loaded in tension with weight Mg the minimum area A of the rope should be
Internal energy of a system increases by 60 J when 140 Jof heat is added to the gaseous system. The amount of work done would 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: Displacement of a body may be zero when distance travelled by it is not zero.
Reason: Displacement is the longest distance between initial and final positions.
Assertion: Mass of moving photon varies inversely as the wavelength.
Reason: Energy of the particle = Mass x (speed of light)2
Two simple harmonic motions are represented by the equations and y2 = 0.1 cos πt. The phase difference of the velocity of particle 1, with respect to the velocity of particle 2, 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 answer.
Assertion: Thermodynamic processes in nature are irreversible.
Reason: Dissipative effects cannot be eliminated.
The First Law of Thermodynamics states that:
A body is executing S.H.M When its displacement from the mean position is 4 cm and 5 cm, the corresponding velocities of the body are 10 cm per sec and 8 cm per sec. Then the time period of the body is
Calculate the temperature, in K, at which a perfect black body radiates at the rate of 5.67 watts cm-2, σ = 5.67 x 10-8 watts m-2 K-4.
In the following question, a statement of Assertion is given, followed by a corresponding statement of Reason. Read both the statements and mark the correct answer as
(a) if both Assertion and Reason are true and Reason is the correct explanation of Assertion
(b) if both Assertion and Reason are true, but Reason is not the correct explanation of Assertion
(c) if Assertion is true, but Reason is false
(d) if both Assertion and Reason are false
Assertion: The amplitude of an oscillating pendulum decreases gradually with time.
Reason: The frequency of an oscillating pendulum decreases with time.
A point particle of mass 0.1 kg is executing SHM of amplitude 0.1 m. When the particle passes through the mean position, its KE is 8 x 10-3 J. What is the equation of motion of this particle if the initial phase of oscillation is 45°?
A wave equation is given by where 'x' is in cm and 't' is in seconds. Which of the following expressions is true?
In the following question, Statement - 1 (Assertion) is followed by Statement - 2 (Reason). The question has the following four choices, out of which only one choice is correct.
Statement 1: The displacement of a simple harmonic oscillator is given by: x = A sin (ωt+φ) This equation suggests that the energy of the oscillator remains constant.
Statement 2: The same value of x is obtained after an interval equal to the time period of the oscillator.
A fixed thermally conducting cylinder has a radius R and height L0. The cylinder is open at its bottom and has a small hole at its top. A piston of mass M is held at a distance L from the top surface, as shown in the figure. The atmospheric pressure is p0.
The piston is taken completely out of the cylinder. The hole at the top is sealed. A water tank is brought below the cylinder and put in a position, so that the water surface in the tank is at the same level as the top of the cylinder, as shown in the figure. The density of the water is . In equilibrium, the height H of the water column in the cylinder satisfies which of the following equations? (It is to be assumed that all processes occur isothermally.)
Nine particles have speeds of 5.00, 8.00, 12.0, 12.0, 12.0, 14.0, 14.0, 17.0, and 20.0 m/s. find the particles’ average speed.
What is the root-mean-square speed of helium atoms in a balloon of diameter 30.0 cm at 20.00C and 1.00 atm?
A heat engine takes in 900 J of heat from a high temperature reservoir and produces 300 J of work in each cycle. What is its efficiency?
Read the assertion and reason carefully to mark the correct option out of the options given below:
Assertion : The heat supplied to a system is always equal to the increase in its internal energy.
Reason : When a system changes from one thermal equilibrium to another, some heat is absorbed by it.
A uniform string of length 1.5 m has two successive harmonics of frequencies 70 Hz and 84 Hz. The speed of the wave in the string is
The temperature-entropy diagram of a reversible engine cycle is given in the figure. Its efficiency is
The ratio of maximum acceleration to maximum velocity of a particle performing S.H.M is equal to
A monoatomic gas is supplied heat Q very slowly, keeping the pressure constant. The work done by the gas will be
The kinetic energy of a body executing S.H.M. is 1/3 of the potential energy. Then, the displacement of the body is x percent of the amplitude, where x is
Assertion : The specific heat of a gas is an adiabatic process is zero and in an isothermal process is infinite.
Reason : Specific heat of a gas in directly proportional to change of heat in system and inversely proportional to change in temperature.
Assertion: The ratio of inertial mass to gravitational mass is equal to one.
Reason: The inertial mass and gravitational mass of a body are equivalent.
When light is refracted into a denser medium,
Consider three waves z1, z2 and z3 as
z1 = A sin (kx - ωt)
z2 = A sin (kx + ωt)
z3 = A sin (ky - ωt)
Which of the following represents a standing wave?
Estimate the total number of air molecules (inclusive of oxygen, nitrogen, water vapor and other constituents) in a room of capacity 25.0 m3 at a temperature of 270C and 1 atm pressure.
In the given P-V diagram, I is initial state and F is the final state.
The gas goes from I to F by (i) IAF, (ii) IBF and (iii) ICF. The heat absorbed by the gas is
Period of a periodic motion is the ________ interval of time after which the motion is __________.
The work of 146 kJ is performed in order to compress one kilo mole of a gas adiabatically, and in this process, the temperature of the gas increases by 7℃.
The gas is (R = 8.3 J mol-1 K-1)
10 g of ice at 0°C is mixed with 100 g of water at 50°C. What is the resultant temperature of the mixture?
(Given: Specific heat of water = 1 cal/gram/°C; Latent heat of ice = 80 cal/gram)
Assertion: The satellites equipped with electronic devices are called active satellites.
Directions: 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.
Reason: Passive satellite works as active satellite. Passive satellite works as active satellite.
The equation for two waves obtained by two light sources are as given below:
y1= A1 sin 3wt, y2 = A2 cos (3wt + p/6). What will be the value of phase difference at the time t _
In a Carnot engine, efficiency is 40% at hot reservoir temperature T. For efficiency to be 50%, what shall be the temperature of the hot reservoir?
The given graph corresponds to which equation?
Four liters of a diatomic ideal gas ( λ =1.4) confined to a cylinder is subject to a closed cycle. Initially, the gas is at 1.00 atm and at 300 K. First, its pressure is tripled under constant volume. Then, it expands adiabatically to its original pressure. Finally, the gas is compressed isobarically to its original volume. Find the temperature at the end of the cycle
In an adiabatic process gas is reduced to quarter of its volume. What would happen to its pressure? Given ratio of specific heats γ= 2
A rubber ball with water, having a small hole in its bottom is used as the bob of a simple pendulum. The time-period of such a pendulum:
In a Carnot engine, when T2 = 0°C and T1 = 200°C, its efficiency is η1. When T1 = 0°C and T2 = -200°C, the efficiency is η2. What is η1/η2?
In a 30.0-s interval, 500 hailstones strike a glass window with an area of 0.600 m2 at an angle of 45.0° to the window surface. Each hailstone has a mass of 5.00 g and a speed of 8.00 m/s. If the collisions are elastic, what is the pressure on the window?
Assertion: In photoelectron emission, the velocity of electron ejected from near the surface is larger than that coming from the interior of the metal.
Reason: The velocity of ejected electron will be zero.
Assertion: In He-Ne laser, population inversion takes place between energy levels of neon atoms.
Reason: Helium atoms have a meta-stable energy level.
Assertion: Dielectric polarisation means formation of positive and negative charges inside a dielectric.
Reason: Free electrons are formed in this process.
This questions consist of two statements, each printed as Assertion and Reason. While answering this questions, you are required to choose any one of the following four responses.
Assertion (A): Molarity of 0.1 N solution of HCl is 0.1 M.
Reason (R): Normality and molarity of a solution are always equal.
Assertion : If one component of a solution obeys Raoult’s law over a certain range of composition, the other component will not obey Henry’s law in that range.
Reason : Raoult’s law is a special case of Henry’s law.
Assertion (A): Molarity of a solution changes with temperature.
Reason (R): Molarity is dependent on volume of solution.
The molal elevation constant is the ratio of the elevation in B.P to:
Which of the two has lower freezing point, 2m NaCl or 5m NaCl aqueous solution?
If the vapour pressure of pure solvent A is 17.5 mm and lowering of vapour pressure of solution formed by adding a non-volatile electrolyte is 0.0175 mm then what is the relative lowering of vapour pressure?
Which of the following unit of concentration is independent of temperature?
Relative lowering of vapour pressure is directly proportional to
CO(g)is dissolved in H2Oat 25°C and 0.010 atm. Henry’s law constant for this system is 5.80 x104 atm. Thus, mole fraction of CO(g)is
H2S gas is used in qualitative analysis of inorganic cations. Its solubility in water at STP is 0.195 mol kg-1. Thus, Henry’s law constant (in atm molar-1) for H2S is
Concentration of C02 (in mole fraction) in fat when partial pressure of C02 is 55 kPa at 25° C, is (Henry’s law constant of C02 = 8.6 x 104 torr)
The E° in the given diagram is,
What is cell entropy change of the following cell?
Pt(s) | H2(g) | CH3COOH, HCl || KCl (aq) |Hg2Cl2| (s) | Hg
P = 1 atm 0.1M 0.1M
Emf of the cell is found to be 0.045 V at 298 K and temperature coefficient is
3.4 x10–4 VK–1
Given Ka (CH3COOH) = 10–5 M
Following cell has EMF 0.7995 V.
Pt | H2 (1 atm) | HNO3 (1M) || AgNO3 (1M) | Ag
If we add enough KCl to the Ag cell so that the final Cl- is 1M. Now the measured emf of the cell is 0.222 V.
The Ksp of AgCl would be :
We have taken a saturated solution of AgBr.Ksp of AgBr is 12 x 10 – 14 . If 10 – 7 mole of AgNO3 are added to 1 litre of this solution then the conductivity of this solution in terms of 10 – 7 Sm – 1 units will be
At 298K the standard free energy of formation of H2O(L) is – 237.20kJ/mole while that of its ionisation into H+ ion and hydroxyl ions is 80 kJ/mole, then the emf of the following cell at 298 K will be
H2(g,1 bar) | H+ (1M) || OH– (1M) | O2 (g, 1bar)
Which of the following cell can produce more electric work.
A hydrogen electrodes is immersed in a solution with pH = 0 (HCl). By how much will the potential (reduction) change if an equivalent amount of NaOH is added to the solution. (Take PH2 = 1 atm) T = 298 K.
Calculate the EMF of the cell at 298 K
Pt|H2(1atm)|NaOH(xM),NaCl(xM)|AgCl(s)|Ag
If E°cl-/AgCl/Ag = + 0.222 V
A current of 0.1A was passed for 2hr through a solution cuprocyanide and 0.3745g f copper was deposited on the cathode. Calculate the current efficiency for the copper deposition.
With t taken in seconds and I taken in Amp, the variation of I follows the equation
t2 + I2 = 25
what amount of Ag will be electrodeposited with this current flowing in the interval 0-5 second ? (Ag : 108)
A resistance of 50Ω is registered when two electrodes are suspended into a beaker containing a dilute solution of a strong electrolyte such that exactly half of the them are submerged into solution. If the solution is diluted by adding pure water (negligible conductivity) so as to just completely submerge the electrodes, the new resistance offered by the solution would be
The following question has four choices out of which ONLY ONE is correct.
Which of the following statements is true for 0.1 M aqueous solution of glucose and an aqueous solution of potassium chloride of the same concentration?
Which of the following aqueous solutions will have the lowest freezing point?
Which of the following colligative properties can provide molar masses of proteins (or polymers or colloids) with the greatest precision?
The osmotic pressure of a dilute solution decreases when
The following question has four choices out of which ONLY ONE is correct. Blood cells do not shrink in blood because blood is ______ with respect to the cell cytoplasm.
Isotonic solutions have the same
What is the mass of glucose in a 1 kg aqueous solution that is 30% by mass?
Ethanol dissolves in water because
Which of the following is not a characteristic of an ideal solution?
Assertion: Copper reacts with dilute HCI to liberate hydrogen.
Reason: Hydrogen is present below Cu in the reactivity series.
Which of the following statements is true for the electrochemical Daniel cell?
In the following question, a statement of Assertion is given, followed by a corresponding statement of Reason. Read the statements carefully and mark your answer accordingly.
Assertion: Copper metal gets readily corroded in an acidic aqueous solution.
Reason: Free energy change for this process is positive.
The chemical reaction, 2AgCI(g) + H2(g) → 2HCI(aq) + 2Ag(s) taking place in a galvanic cell is represented by the notation:
In the following question, a statement of Assertion is given followed by a corresponding statement of Reason just below it. Of the statements, mark the correct answer as:
Assertion: Galvanised iron does not rust.
Reason: Zinc has a more negative electrode potential than iron.
The products formed when an aqueous solution of NaBr is electrolysed in a cell having inert electrodes are
Assertion: In the electrolysis of aqueous NaCl, Na is preferentially discharged at the mercury cathode forming sodium amalgam.
Reason: This is due to the fact that hydrogen has a high over voltage at the mercury cathode.
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 accordingly.
Assertion: Eo for Mn3+/Mn2+ is more positive than that for Cr3+/Cr2+.
Reason: The third ionisation energy of Mn is larger than that of Cr.
In the following question a statement of Assertion is given followed by a corresponding statement of Reason just below it. Of the statements, mark the correct answer as:
Assertion: For the Daniel cell Zn | Zn2+ || Cu2+ | Cu with Ecell = 1.1 V, the application of opposite potential greater than 1.1 V results into flow of electron from cathode to anode.
Reason: Zn is oxidised at the anode and Cu is deposited at cathode.
A current of 96.5 A is passed for 18 minutes between nickel electrodes in 500 mL solution of 2 M Ni(NO3)2. The molarity of the solution after electrolysis would be:
Assertion: According to Kohlrausch law, the molar conductivity of a strong electrolyte at infinite dilution is the sum of molar conductivities of its ions.
Reason: The current carried by cation and anion is always equal.
Label the part marked by the blue arrow.
How do the top three layers assist in developing anthers?
Following the establishment of the endosperm, ___ split.
Identify “A” and “B” in the T.S of mature anther:
How many meiotic divisions are required to form 64 pollen grains?
Filiform apparatus present at micropylar part of the Synergids help in:
What happen to haploid megaspores formed by megaspore mother cell in an angiospermic plant?
Assertion: The innermost layer of microsporangium is called tapetum.
Reason: Tapetum performs the function of protection and help in dehiscence of anther to release pollen grains.
A bilobed dithecous anther had 50 microspore mother cells per microsporangium. How many male gametes this anther can produce?
Pollen grain of large number of species can be stored in:
In nature, inbreeding and out breeding of plants is regulated by------?
Continued self-pollination results in inbreeding depression as they------?
Abundant occurrence of fossilized pollen grain is due to resistant:
At the _______ end, embryogenesis happens.
The correct sequence of parts of female reproductive organ in plants
If an endosperm cell of angiosperm contain 24 chromosome, the number of chromosome in each cell of root is?
The meiocyte of an onion plant contains 32 chromosomes. Calculate the number of chromosomes found in its endosperm?
Epiblast present in certain monocot embryo represents--------?
A typical angiospemic embryo sac is though 8 nucleate is 7-celled. 8 nuclei includes______.
The major approach towards the crop improvement programme is______.
Which of the following parts of a plant take part in sexual reproduction?
In which of the following plants fruit contain larger number of seed?
Dormancy is the____.
Which of the following walls of microsporangium has more than one nucleus per cell?
During germination, a seedling develops from a/an
Which of the following cells undergoes meiotic division?
a. Microspore mother cell
b. Megaspore mother cell
c. Sporogenous cells
d. Microspores
Besides cellulose, the intine layer of pollen grains also contains
Perisperm is a residual nucellus, which persists in some seeds. In which of the following plants it is found?
Which of the following flowers is a bisexual, homogamous and pollination takes place in it prior to its opening?
The number of ovules in an ovary may be one or many. In which of the following plants a single ovule might be present in the ovary?
Which of the following is an aquatic plant that does not use water for pollination?
By which kind of pollination method can assured seeds be produced even in the absence of pollinators?
What is the ratio of antipodal cells: polar cell: synergids in embryo sac?
Which of the following sentences about megasporogenesis is false?
Apomixis is a phenomenon found in some grasses. What happens during apomixis?
Microsporangium is generally surrounded by _____ wall layers and the layer that performs the function of providing nutrition to pollen is ______.
Match the following:
Where can pollen from multiple species be preserved?
Through which cell of the embryo sac does the pollen tube enter the embryo sac?
The coconut water from tender coconut represents
Milky water in green coconut is:
Perisperm is:
Identify the parts marked 1, 2, 3 and 4 in the diagram given below.
If there are 100 microspore mother cells in an anther, the number of tetrads formed will be:
Which statement is not correct?
In human females, meiosis-ll is not completed until?
In a pregnant woman having prolonged labour pains, if the childbirth has to be hastened, it is advisable to administer a hormone that can
The body of sperm is covered by _______
What part of sperm holds the haploid chromatin?
Spermatogenesis and sperm differentiation are under the control of
Sugar fructose is present in the secretion of
The number of egg cells produced as a result of meiosis in humans is
How many eggs will be formed from 100 primary oocytes
A hormone secreted by the posterior lobe of the pituitary is concerned with
In the human being, developing embryo remains in
Corpus luteum is
Which of the following statements are related to Bartholin's gland?
Proliferative phase of menstrual cycle is also called
Which of the following forms the birth canal?
Menstrual cycle occurs in
Identify the human development stage shown below as well as the related right place of its occurrence in a normal pregnant woman and select the right option for the two, together
Given below are four statements (i)-(iv) regarding embryonic development in humans.
(i) Cleavage divisions bring about considerable increase in the mass of protoplasm.
(ii) With more cleavage divisions, the resultant blastomeres become smaller and smaller.
(iii) The blastomeres in the blastocyst are arranged into two layers, trophoblast and endometrium.
(iv) Cleavage divisions result in a solid ball of cells called morula.
Which of the above two statements are correct?
In spermatogenesis, reduction division of chromosome occurs during the conversion of
Seminal plasma in humans is rich in
Which of the following events is correctly matched with the time period in a normal menstrual cycle?
Which set is similar?
Ovulation takes place in a month between
The bulbourethral glands in males are also known as:
Spermatogenesis begins during puberty due to the increased secretion of
Secondary spermatocytes and spermatids are
The yellow-coloured first milk that comes out from the mother's mammary glands, just after the child birth, is
During gametogenesis, how many sperms and ova will be produced from 25 primary spermatocytes and 25 primary oocytes, respectively?
Which one of the following is not the function of placenta?
Which of the following is untrue about the menstrual cycle?
Select the correct option describing gonadotropin activity in a normal pregnant female.
The sixth month of normal pregnancy is accompanied by
Regeneration of endometrium through proliferation of uterine and fallopian tube cells occurs at
The vas deferens receives duct from the seminal vesicle and opens into urethra as
All of the following are haploid, except
Which of the following characterises the ampulla of the fallopian tube?
The maximum contribution to semen is made by
Second meiotic division during spermatogenesis leads to the formation of
In which of the following anatomical structures are ciliated epithelium most numerous?
If the vas deferens of a man is surgically blocked,
Changes occurring in the uterus during the post-menstrual phase are governed by
Menstrual flow occurs due to lack of
Zona pellucida is a membrane of egg. It is the
During organogenesis, pineal glands develop from a layer which also gives rise to
During the gestation period, the end of twenty weeks of the fetus is characterised by
Greater vestibular glands in females are homologous to which of the following in males?