JEE Main Test 103

Result

JEE Main Test 103

Score
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Weekly Quiz Competition

Question 1
4 / -1

An elements has 8 electrons in its last shell which of the following is correct?

A
It will lost electrons

B
It will gain electrons

C
It neither gain nor lose electrons

D
None of the above

Solution

According to ocfet rule, A chemical rule of thumb that reflects observation that toms of main – group elements tend to combine in such a way that each atom has eight electrons in valence shell, giving it the same electronic configuration as a noble gas. In this case an element has stable configuration. Therefore element neither gain noe lose electrons.
Question 2
4 / -1

Which of the following molecules has the maximum dipole moment ?

A
CO₂

B
CH₄

C
NH₃

D
NF₃

Solution
Question 3
4 / -1

According to Maxwell's law of distribution of velocities of molecules, the most probable velocity is

A
greater than the mean velocity

B
equal to the mean velocity

C
equal to the root mean square velocity

D
less than the root mean square velocity

Solution
Question 4
4 / -1

A

B

C

D

Solution
Question 5
4 / -1

The motion of a particle varies with time according to the relation, y = a (sin ωt + cos ωt) .

A
The motion is oscillatory but not SHM

B
The motion is SHM with amplitude a

C
The motion is SHM with amplitude a√2

D
The motion is SHM with amplitude 2a

Solution
Question 6
4 / -1

The shape of XeF₄ molecule and hybridisation of xenon in it are

A
tetrahedral and sp³

B
square planar and dsp²

C
square planar and sp³ d²

D
octahedral and sp³ d²

Solution
Question 7
4 / -1

If A is non - singular matrix of order 3, then adj (adj A) is equal to

A
A

B
A^-1

C
(1/|A|) A

D
|A| A

Solution

Given, A is a non-singular matrix of order 3,then
Question 8
4 / -1

A

B

C

D

Solution
Question 9
4 / -1

A charge q is placed at the centre of the line joining two equal point charges each equal to Q. The system of three charges will be in equilibrium if q is equal to

A
+Q/ 4

B
–Q/ 2

C
+Q/ 2

D
–Q/4

Solution
Question 10
4 / -1

A 20 cm long string, having a mass of 1.0 g, is fixed at both the ends. The tension in the string is 0.5 N. The string is set into vibration using an external vibrator of frequency 100 Hz. Find the separation (in cm) between the successive nodes on the string.

A
5

B
6

C
2

D
3/2

Solution