Recent questions tagged past papers

First product of the reaction between RCHO and $NH_2$ $NH_2$ : -

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Polarization in acrolein as :

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Ethyl benzoate can be prepared from benzoic acid by using :

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Increasing order of electrophilic substitution for following compounds :

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Which pair have not equal dimensions :

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Two bulbs of (40 W, 200 V), and (100 W, 200 V). Then correct relation for their resistance :

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A car battery of emf 12 V and internal resistance $5\times10^{-2}\Omega$, receives a current of 60 Å from external source, then terminal voltage of battery is :

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Who evaluated the mass of electron indirectly with help of charge :

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Nuclear – Fission is best explained by :

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Two spherical bob of masses $M_A$ and $M_B$ are hung vertically from two strings of length $l_A$ and $l_B$ respectively. They are excuting SHM with frequency relation $f_A$ =$2f_B$ , Then :

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For the adjoining diagram, a triangular lamina is shown the correct relation between $I_1$, $I_2$ & $I_3$ is (I – moment of inertia)

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If $\overrightarrow{F}$ = $(60 \hat{i} + 15 \hat{j} – 3 \hat{k} ) N $ and $\overrightarrow{V }= (2 \hat{i} – 4\hat{j} + 5 \hat{k} ) m/s$, then instantaneous power is :

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A string is cut into three parts, having fundamental frequencies $n_1$, $n_2$ and $n_3$ respectively. Then original fundamental frequency 'n' related by the expression as :

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Two stationary sources each emitting waves of wave length $\lambda$. An observer moves from one source to other with velocity u. Then number of beats heared by him :

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The value of quality factor is :

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A charge having q/m equal to $10^8$ c/kg and with velocity $3 × 10^5$ m/s enters into a uniform magnetic field $B = 0.3$ tesla at an angle $30^{\circ}$ with direction of field. Then radius of curvature will be :

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For adjoining fig., The magnetic field at point, 'P' will be : 5A P 2.5A 2.5 m 5m

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A charge Q the electric flux passed through all the six faces of the cube is :

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By photo electric effect, Einstein proved :

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For a plane convex lenx $(\mu = 1.5)$ has radius of curvature 10 cm. It is silvered on its plane surface. Find focal length after silvering :

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Gravitational force is required for :

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Rainbow is formed due to :

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A body of weight 72 N moves from the surface of earth at a height half of the radius of the earth, then gravitational force exerted on it will be :

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A man is slipping on a frictionless inclined plane & a bag falls down from the same height. Then the speed of both is related as :

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For the given reaction, the particle X is : ${6^C}^{11}\rightarrow{5^B}^{11}+\beta^+{+}X$

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A mass is performing vertical circular motion (see figure).If The average velocity of the particle is increased, then at which point the string will break :

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Two projectiles of same mass and with same velocity are thrown at an angle 60º & 30º with the horizontal, then which quantity will remain same :

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What happens in light reaction (Photo chemical reaction ) :

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Role of enzyme in reactions :

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Lysosome contains :

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A student observed an algae with chl. 'a' 'd' and phycoerythrin it should belong to :

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Which of the following is used to manufacture ethanol from starch :

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Extranuclear DNA is found in :

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Cleavage in mammals :

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Blastopore is the pore of :

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Which of the following animals have scattered cells with cell – tissue grade organisation :

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Black rust of wheat is caused by :

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Mangolian idiots are due to trisomy in 21st chromosome is called :

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Viable material of endangered species can be preserved by :

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Proteoglycan in cartilages which is part of polysaccharide :

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Which of the following have carbohydrate as prosthetic group :

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Spindle fibre unite with which structure of chromosomes :

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Function of telomeres in nucleus :

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Saline solution is given to patients of Cholera because :

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In three dimensional view the molecule of t-RNA is :

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Anticodon occurs in :

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Essential amino acid is :

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Irregularity is found in drosophila during the organ differentiation for example- inplace of wing, long legs are formed. Which gene is responsible for :

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Plasmid has been used as vector because :

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