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JEE 2020: Weekly Quiz 20 (18.08.2019)
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Question 1
Given,
Which of the given compounds can exhibit tautomerism?
Question 2
How many stereoisomers does this molecule have?
Question 3
The correct order of increasing reactivity of C-X bond towards nucleophile in the following compounds is
Question 4
In which of the following molecules, all atoms are coplanar?
Question 5
Two possible stereo-structures of CH3CHOH.COOH, which are optically active, are called
Question 6
In the Kjedahl’s method for estimation of nitrogen present in soil sample, ammonia evolved from 0.75g of sample neutralized 10ml. of 1M H2SO4 The percentage of nitrogen in the soil is:
Question 7
The most suitable method of separation of 1:1 mixture of ortho and para-nitrophenols is:
Question 8
The Lassaigne’s extract is boiled with conc HNO3 while testing for halogens. By doing so it
Question 9
The difference between amylose and amylopectin is
Question 10
Regarding cross-linked or network polymers, which of the following statements is incorrect?
Question 11
In a school’s garden a boy sees that the circular pipes of cross-section with diameters and water flows through it. Then what is the ratio of velocities in the two pipes he found
Question 12
In Physics Lab experiment teacher explain laws of fluid and he put a capillary in dipped water vertically, the height of water column in the capillary is. When the capillary is bent according to the figure, the height of water column will become
Question 13
A student performs an experiment on elasticity so he takes a wire of length 50 m that equals to height of his school building and the cross-section area of wire 25 m2 and Young modulus behaves as a spring of spring constant k, then
Question 14
A load of is supported from a pulley which in turn is supported by a rope of cross sectional area and Young’s modulus. Neglecting the friction at pulley determine deflection of the load.
Question 15
A metal wire of length is suspended vertically from a rigid support. When a body of mass is attached to the lower end of wire, the elongation of the wire is.
Question 16
1000 dropets of water having 2mm diameter each coalesce to form a sing drop. Given the surface tension of water is 0.072 N m-1. The energy loss in the process is
Question 17
Two capillary tubes of different diameters are dipped in water. The rise of water is
Question 18
The following observations were taken for determining surface tension T of water by capillary method:
diameter of capillary, D=1.25×10-2 m rise of water, h=1.45×10-2 m.
Using g=9.80 m/s2 and the simplified relation the possible error in surface tension is closest to:
diameter of capillary, D=1.25×10-2 m rise of water, h=1.45×10-2 m.
Using g=9.80 m/s2 and the simplified relation the possible error in surface tension is closest to:
Question 19
The rate of flow of liquid through a capillary tube in an experiment to determine the viscosity of liquid, increases -
Question 20
A ball is made of a material of density ρ where ρoil < ρ < ρwater with ρoil and ρwater representing the densities of oil and water, respectively. The oil and water are immiscible. If the above ball is in equilibrium in a mixture of this oil and water, which of the following pictures represents its equilibrium position ?
Question 21
In the given figure what is the relation between Q and P
Question 22
Two lines are such that they are at an angle S to each other. The equations of the lines are given as follows. The distance between the points (2,3,4) and (4,6,10) is D. find Dcos S
L1:
L2:
L1:
L2:
Question 23
Find the PN of point P (8,5,7) from straight line passing through A (2, 7,0) given that the direction ratios are 3,4,0
Question 24
The angle between two lines whose direction cosines are given by the equation l+ m + n = 0 and =0 is
Question 25
Find the ratio in which the line formed between the lines (5,6,7) and (-10,-14,-18) is divided at the point (2,2,2)
Question 26
The lines and are coplanar and then equation to the plane in which they lie, is
Question 27
The points are A (4, 5, 1), B (0, – 1, – 1), C(3, 9, 4) and D(– 4, 4, 4)
Question 28
The coplanar points A, B, C, D are , and respectively, then
Question 29
Lines are coplanar then equation of plane in which they lie is
Question 30
The direction ratios of two lines are a, b, c and 1/bc, 1/ca, 1/ab. The lines are
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Jan 21JEE & BITSAT