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# JEE Free Doubts and Solutions

### IIT JEE - Main - Mathematics

## Solve the question in photo showing each step clearly

**Vidushi412**25th April 2019, 7:10 PM

### IIT JEE - Main - Chemistry

## Is fluorobenzene or chlorobenzene more reactive towards SNAr ( Substitution Aromayic Nucleophilic Reaction) ? I heard it is fluorobenzene but shouldn't it be chlorobenzene because chlorine deactivates the benzene ring more than fluorine?

**sumayiah2000**25th April 2019, 1:53 PM

### IIT JEE - Main - Physics

## Two circular discs A and B have equal masses and uniform thickness but have densities ρ1 and ρ2 such that ρ1>ρ2. their moment of inertia is

**tusharsaumyaab**25th April 2019, 1:12 PM

### IIT JEE - Main - Physics

## Carbon, Silicon and germanium atoms have 4 valence electrons each. Their valence and conduction bands are separated by energy band gaps represented by (EG)c,(EG)si and (EG)Ge, repectively. what is the relationship between above these things?

**jmorakhia**24th April 2019, 7:12 PM

### IIT JEE - Main - Physics

## In a diode vaccum tube, the plate voltage is 160 V , a grid is introduced between the plate and the cathode and a voltage of -2 V is applied to it the plate current will become (if gm = 5* 10^-3ohms^-1)

**jmorakhia**24th April 2019, 7:11 PM

### IIT JEE - Main - Physics

## A vessel contains oil (density 0.8 g/cc) over mercury (density 13.6 g/cc ). A homogeneous sphere floats with half its volume immersed in mercury and other half in oil . The density of the material is ?

**jmorakhia**24th April 2019, 7:11 PM

### IIT JEE - Main - Physics

## A block of ice of area A and thickness 0.5 m is floating in the fresh water. In order to just support a man of 100kg, the area of A should be (specefic gravity of ice 0.917 and the density of water = 1000 kg/m^3)

**jmorakhia**24th April 2019, 7:08 PM

### IIT JEE - Main - Physics

## A closed rectangular tank 10 m long, 5 m wide 3 m deep is completely filled with an oil of specific gravity 0.92. Find the pressure diffference between the rear and front cornres of tank, if its moving with an acceleration of 3m / s^2 in the horizontal direction?

**jmorakhia**24th April 2019, 6:35 PM

### IIT JEE - Main - Mathematics

## Each of the distinct numbers A and B exceeds its reciprocal by Unity. Find the value of a + b

**tusharbailwal8**24th April 2019, 5:28 PM

### IIT JEE - Main - Physics

## Why do we take radius as half of focal length in this problem ?

**nipunverma59**24th April 2019, 4:05 PM

### JEE Plances - JEE (Main) - Mathematics

## Detailed solution for this.

**g_archanasharma**16th December 2018, 6:20 PM

### JEE Plances - JEE (Main) - Mathematics

## Detailed solution for this.

**g_archanasharma**16th December 2018, 6:19 PM

### JEE Plances - JEE (Main) - Mathematics

## Detailed solution for this.

**g_archanasharma**16th December 2018, 6:18 PM

### JEE Plances - JEE (Main) - Mathematics

## Detailed solution for this.

**g_archanasharma**16th December 2018, 6:11 PM

### JEE Plances - JEE (Main) - Mathematics

## Detailed solution for this.

**g_archanasharma**16th December 2018, 6:09 PM

### JEE Plances - JEE (Main) - Mathematics

## Sir pls solve this question.

**rsudipto**15th December 2018, 6:13 PM

### JEE Plances - JEE (Main) - Mathematics

## Sir in this question how is the inverse fn derived. Pls explain in details.

**rsudipto**15th December 2018, 8:55 AM

### JEE Plances - JEE (Main) - Mathematics

## Sir pls solve this question.

**rsudipto**14th December 2018, 9:52 AM

### JEE Plances - JEE (Main) - Mathematics

## Sir pls solve this question.

**rsudipto**14th December 2018, 9:51 AM