|1 Crore+ students have signed up on EduRev. Have you?|
The part of cockroach having both exoskeleton and endoskeleton (tentorium and apodemes) is
The decreasing order of mineral concentration in a cell is
Which of the following blood vessels has a thin elastic layer?
Enzyme required for removing RNA primer during DNA replication is
Epistasis in which dihybrid ratio of 9:3:3:1 between AaBb X AaBb is modified is
In Red-White flowered cross of Mirabilis jalapa, F generation has red, pink and white flowered plants in the ratio of
Surgical removal of thymus of a new born shall result in failure to produce
Which one of the following substances plays an important role in biochemical defence of host plants?
For the manufacture of wines and beers the microorganism that is employed is
The two great industrial tragedies namely, MIC and chernobyl, respectively occured where and when?
Increase in the concentration of pollutants in higher trophic levels is called
Fossils of organisms found in South America resemble most of the fossils in
Which substance would normally be found in higher concentration in urine than in blood?
Which substance is found in the glomerulus, Bowman’s capsule and efferent arteriole but is not normally found in the collecting duct?
Voltage and current in an A.C. circuit are given by V = 5 sin(100πt - π/6) and I = 4sin(100πt + π/6)
Δ λ is the difference between the wavelength of Kα line and the minimum wavelength of a continuous X - ray spectrum when the X - ray tube is operated at a voltage V. If the operating voltage is changed to V/3 , then the above difference is Δλ1 . Then
A parallel plate capacitor is filled by copper plate of thickness b. The new capacity will be
A steady current of 1.5 A flows through a copper voltameter for 10 min. If the electrochemical equivalent of copper is 30 x 10-5 g C-1 , the mass of copper deposited on the electrode will be
A car battery has e.m.f. 12 volt and internal resistance 5 x 10-2 ohm. If it draws 60 ampere current, the terminal voltage of the battery will be
Two cells with the same e.m.f 'E' and different internal resistances r1 and r2 are connected in series to an external resistance R. The value of R so that the potential difference across the first cell be zero is
Four resistances 10 Ω , 5 Ω , 7 Ω and 3 Ω are connected so that they form the sides of a rectangle AB, BC, CD and DA respectively. Another resistance of 10 Ω is connected across the diagonal AC. The equivalent resistance between a A and B is
The net resistance of a voltmeter should be large to ensure that
In Thomson's experiment of finding e/m for electrons, beam of electron is replaced by that of muons (particle with same charge as that of electrons but of mass 208 times that of electron). No deflection condition in this case is satisfied if
In the condition of no deflection e/m = E2/2VB2
⇒ If m is increased by 208 times then B should be increased 208 = 14.4 times
The wing span of an aeroplane is 36 m. If the plane is flying at 400 km/h, the e.m.f. induced between the wings tips is (assume V=4X10)
If the electric flux entering and leaving an enclosed surface respectively is φ1 and φ2 , the electric charge inside the surface will be
Potential energy of two equal positive charges 1 μ C each held 1 m apart in air is
Two equal charges q of opposite sign separated by a distance 2a constitute an electric dipole of dipole moment p. If P is a point at a distance r from the centre of the dipole and the line joining centre to this point makes an angle θ with the axis of the dipole, then potential at the point P is given by
Minimum no. of 8 μF and 250 V capacitors, used to make a combination of 16 μF and 1000 V, is
A 10 μF capacitor is charged to a potential difference 50 V and it is then connected to another uncharged capacitor in parallel. If common potential difference becomes 20 V, then capacitance of the second capacitor is
Two point charges each equal to 2μC are 0.5 m apart. If both of them exist inside vaccum, then electrostatic force between them is
By using F = 9x109 . Q2 /r2
If current in a moving coil galvanometer is increased by 1%, then percentage increase in its deflection will be
If MO is the mass of an oxygen isotope 8O17 , Mp and Mn are the masses of a proton and a neutron, respectively, the nuclear binding energy of the isotope is
Light of wavelength 5000Å falls on a sensitive plate with photoelectric work function of 1.9 eV. The kinetic energy of the photoelectron emitted will be
In photoelectric effect experiment, the stopping potential for incident light of wave-length 4000 Å is 2 volt. If the wavelength is changed to 3000 Å, the stopping potential is
The distance between eye lens and cross wire in Ramsden eye piece which has a field lens of focal length 1.2 cm is .......cm.
If the dispersive power of a lens material of focal length 20 cm is 0.08, then longitudinal chromatic aberration of the lens is
In a transistor circuit, when the base current in increased by 50 micro - amperes keeping the collector voltage fixed at 2 volts, the collector current increases by 1 m A. The current gain of the transistor is
If no external voltage is applied across p-n junction, there would be
Consider the following statements A and B and identify the correct choice of the given answers.
A: The width of the depletion layer in a P-N junction diode increases in forwards bias
B: In an intrinsic semiconductor the fermi energy level of exactly in the middle of the forbidden gap
A semiconductor is cooled from T₁K to T₂K. Its resistance
In the depletion region of an unbiased P-N junction diode there are
A train is approaching a platform with a velocity ν. The frequency heard by an observer standing at the station is
Both light and sound waves produce diffraction. It is more difficult to observe the diffraction with light waves because
2R ― OH + 2Na → 2RONa + H₂. In the above reaction the reactivity of different alcohols is
Which of the following does not turn Schiff's reagent to pink ?
When vapours of isopropyl alcohol are passed over heated copper, the major product obtained is
How many monochlorobutanes will be obtained on chlorination of n-butane?
Acid catalysed hydration of alkenes except ethene leads to the formation of
How many moles of Helium gas occupy 22.4 L at 0oC at 1 atm. pressure?
Which one of the following esters is obtained by the esterification of propan-2-ol with ethanoic acid?
The acid showing salt like character in aqueous solutions is
Chemical equilibrium is dynamic in nature, because
The two opposite processes, forward reaction and reverse reaction, keep on occurring in it all the time but at exactly equal rates (or equal speeds)
A chemical reaction does not stop after reaching the equilibrium state, only the rate of the forward and the reverse reactions become equal at the equilibrium state
For an ideal gas, the relation between the enthalpy change and internal energy change at constant temperature is given by
For a reaction at 300 K, enthalpy and entropy changes are -11.5 x 103 J mol-1 and -105J K-1 mol-1 respectively. What is the change in Gibbs free energy?
ΔG = ΔH - TΔS
= -(115x 10)3 - [300 (-105)]
= 11500 - (- 31500) = 20000 J mol-1
= 20 kJ mol-1
Which of the following is an endothermic reaction?
A reaction in which heat is absorbed when reactants are converted into products is called endothermic reaction
N2 g + O2 g + 180.8 K J → 2 NO g
During the reaction heat is absorbed, by the system from the surroundings and ΔH is + ve
So the reaction is endothermic reaction
The substance used in the preparation of malachine green is
In co-ordination compound, the co-ordination number of the metal according to Werner's theory, is
Which of the following is produced by reaction of RCN in sodium and alcohol ?
When benzenediazonium chloride in hydrochloric acid reacts with cuprous chloride, then chlorobenzene is formed. The reaction is called
What is the electrochemical equivalent (in g coulomb-1) of silver?
(Ag = 108; F = Faraday)
A sample of gas occupise 100 ml at 27oC and 740 mm pressure. When its volume is changed to 80 ml at 740 mm pressure, the temperature of the gas will be
At.No. of N is 7, the At. No. of the third member of nitrogen family will be
BCl₃ is a planar molecule whereas Ncl₃ is pyramidal because
Fill in the blank with appropriate word.
If a speech is full of pompous words, it is.........
Choose the alternative which best expresses the meaning of the idiom/phrase.
Improve the sentence by choosing best alternative for capitalised part of the sentence.
I will tell you if and when it WILL BE COMPLETED.