JEE 2020: Weekly Quiz 26 (08.09.2019) for JEE & BITSAT Exams

Question 1

Out of the various possible isomers of C₇H₇Cl, containing a benzene ring, the weakest
C—Cl bond is present in

Question 2

Each of the following compounds gives a white ppt. when boiled with alcoholic silver nitrate except

Question 3

The correct order of reactivity of following compounds in nucleophilic substitution is

(i)

C₂H₅Br

(ii)

C₂H₅Cl

(iii)

(iv)

Question 4

The reaction

CH₃Br + OH^–ÂÂ CH₃OH + Br^– is

Question 5

reaction of alkyl halides lead to

Question 6

Gabriel phthalimide synthesis is used for the preparation of-

Question 7

Identify the order of boiling point of the following amines:

Question 8

Alcohols can be easily identified in the lab by their alcoholic smell. State the way in which we can identify amines in a lab qualitatively.

Question 9

Heating of [CH₃CH₂CH₂CH(CH₃)N⁺(CH₃)₃]OH^- gives, the major product

Question 10

Secondary amine forms yellow oily liquid with nitrous acid, which on warming with phenol and conc. H₂SO₄ gives a brown or red colour and which at once changes into blue-green. This reaction is called as :

Question 11

Choose the correct option
Statement I: Faraday’s law tells that line integral of the electric intensity around any fixed closed path is equal to the time rate of decrease of flux of magnetic induction through the surface enclosed by the curve
Statement II: In case of electromagnetic induction the line integral of induced field

round a closed path is zero i.e. induced electric field is conservative in nature.

Question 12

An aluminium ring B faces an electromagnet A. The current I through A can be altered,

Question 13

Radii of two conducting circular loops are b and a respectively where b > > a. Centers of both loops coincide but planes of both loops are perpendicular to each other. The value of mutual inductance for these loops:

Question 14

For given LR circuit, growth of current as function of time t is shown in graph. Which of the following option represents value of time constant most closely for the circuit?

Question 15

Given figure shows a graph of the magnitude of magnetic field, B versus time, t for a magnetic field that passes through a fixed loop. Then the magnitude of the emf produced in the loop is in order

Question 16

In an AC generator, the peak value of an alternating current is 10 A and its frequency is 50 Hz. So, calculate how long will the current take to reach the peak value starting from zero.

Question 17

The figure shows a bar magnet and a metallic coil. Consider four situations.
(I) Moving the magnet away from the coil.
(II) Moving the coil towards the magnet.
(III) Rotating the coil about the vertical diameter.
(IV) Rotating the coil about its axis.

An emf in the coil will be generated for the following situations

Question 18

A conducting wheel rim in which there are three conducting rods of each of length l is rotating with constant angular velocity ω in a uniform magnetic field B as shown in figure. The induced potential difference between its centre and rim will be

Question 19

Magnetic flux passing through a coil is initially 4 x 10^-4 Wb. It reduces to 10% of its original value in 't' second. If the e.m.f. induced is 0.72 m V then 't' in second is

Question 20

Two coils P and Q are kept near each other. When no current flows through coil P and current increases in coil Q at the rate 10 Puts, the e.m.f. in coil F is 15 mV. When coil Q carries no current and current of 1.8 A flows through coil F, the magnetic flux linked with the coil Q is

Question 21

Among all cyclic quadrilaterals inscribed in a circle of radius R with one of its angles equal to 120°. Consider the one with maximum possible area. Its area is

Question 22

The equation of that diameter of the circle x²+y²-6x+2y-8=0 which passes through the origin is

Question 23

The straight line between the points (1,0) and (4,3) is the longest chord of the circle, then the equation of circle is?

Question 24

If 2x²+2y²+4x+5y+1=0 and 3x²+3y²+6x-7y+3k = 0 are orthogonal, then value of k is

Question 25

The parametric equations of the circle

Question 26

Slopes of tangents through (7,1) to the circle x² + y² = 25 satisfy the equation

Question 27

The line x=at² meets the ellipse

in the real points, if

Question 28

The number of value of C for which the line y = 4x + c touch the curve

Question 29

The slopes of the common tangents of the ellipse

=1 and the circle x² + y² = 3 are

Question 30

If the area of the auxiliary circle of the ellipse $Description: E:\KCET-1-Feb\Karnataka_CET2013_files\image447.png$ = 1(a>b) is twice the area of the ellipse, then the eccentricity of the ellipse is