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JEE Main Class XI Weekly Mock 18
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Question 1
Figure shows a string stretched by a block going over a pulley. The string vibrates in its tenth harmonic in unison with a particular tuning fork. When a beaker containing water is brought under the block so that the block is completely dipped into the beaker, the string vibrates in its eleventh harmonic. The density of the material of the block is–
Question 2
In the interference of two sources of intensities I0 and 9I0 the intensity at a point where the phase difference is 
is-
is- Question 3
If the velocity sound in air is 336 m/s, the maximum length of a closed pipe that would produce a just audible sound is–
Question 4
Two open organ pipes of lengths 50 cm and 50.6 cm produces 4 beats/s. The speed of sound in air is about–
Question 5
The length of an open pipe is 48 cm and its fundamental frequency is 320 Hz. If its one end is closed then its fundamental frequency will be
Question 6
Which will show geometrical isomerism
Question 7
M effect takes part in -
Question 8
Electrophile is
Question 9
Carbanion is
Question 10
An alkane forms isomers if it possess minimum no. of carbon atoms -
Question 11
The radius of a circle, having the minimum area, which touches the curve y=4−x2 at vertex and the lines, y=|x| is
Question 12
The radical axis of two circles-
Question 13
If the sides of a triangle are 3 : 7 : 8 then R : r =
Question 14
If the sides be a, b, c then 
=
= Question 15
If r1 = r2 + r3 + r, then the Δ is -
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Jan 22JEE & BITSAT
