List of top Questions asked in JEE Main

200 J

of heat and expands by

500

cm

^{3}

against a constant pressure of

2 \times 10^{5} N m^{- 2},

then the change in internal energy is:

If the normal at point P

(a t_{1}^{2}, 2 a t_{1})

and

Q

(a t_{2}^{2}, 2 a t_{2})

on the parabola

y^{2} = 4 a x

meet on the parabola, the

t_{1} t_{2}

equals

P Q

and

R S

are two perpendicular chords of the rectangular hyperbola

x y = c^{2}

. If

C

is the centre of the rectangular hyperbola, then the product of the slopes of

C P, C Q, C R

and

C S

is equal to:

The correct order of increasing

C - O

bond length of

C O, C O_{3}^{2 -}, C O_{2}

is:

A body sliding on a frictionless track which terminates in a straight horizontal section CD. The body starts slipping from A and reaches point D. If h1 = 1 m, then how far from point D, will the body hit the ground?Take, g = 10 ms^-2.

In the metal carbonyls of the general formula M(CO)x where M = metal x = 4, EAN rule is satisfied for atomic number of M equal to:

The circle

x^{2} + y^{2} + 4 x - 7 y + 12 = 0

cuts an intercept on

y

-axis of length

The derivative of

s e c^{- 1} (\frac{1}{2 x^{2} - 1})

with respect to

\sqrt{1 - x^{2}}

at

x = \frac{1}{2}

is:

The rate of change of volume of a sphere with respect to its surface area when the radius is 4 cm is:

If A = {1, 2, 3, 4, 6} and R is a relation on A such that R = {(a, b) : a, b ∈ A and b is exactly divisible by a} then find the number of elements present in the range of R?

The number of terms of an

A P

is even. The sum of the odd terms is

24

and of the even terms is

30

. The last term exceeds the first by

10 \frac{1}{2}

. Then the number of terms in the series is ______.

Phenol on reduction with H2 in the presence of Ni catalyst gives:

Which substance is produced when alcohol is added with petrol and used as a fuel?

The shapes of the compounds XeF2, XeF4, XeO3 and XeO4 respectively are:

Directions: The answer to the following question is a single digit integer ranging from 0 to 9. Enter the correct digit in the box given below.

How many open chain structures are possible for N-Methly butanamine (including it) that are referred to as metamers.

The enthalpy of vaporisation of a substance is

8400 J {m o l}^{- 1}

and its boiling point is

- {173.15}^{\circ} C

. The entropy change for vaporisation is:

If the ionisation potential of the hydrogen atom is

13.6 eV

, then what will be the longest wavelength needed to remove an electron from the

1^{st}

Bohr's orbit of

{He}^{+}

ion?

If |x + 1||x + 3| – 4|x + 2| + 5 = 0, then sum of squares of solutions is

In an electromagnetic wave, the magnitude of electric and magnetic fields are 100 V/m and 0.265 A/m. The maximum energy flow is

The sum of the first

16

terms of an AP whose first term and the third term are

5

and

15

respectively is

Hydrogen ion concentration of an aqueous solution is 1 × 10^-4 M. The solution is diluted with equal volume of water. Hydroxyl ion concentration of the resultant solution in terms of p×10^-10 mol dm^-3 . What is the value of p?

A galvanometer has a resistance of 96 Ω and it is desired to pass 4% of the total current through it. The value of shunt resistance is ____?

From the given information, calculate enthalpy of formation of 2 moles of $C_6H_6$(l) at 25°C. Given: $CH(C_6H_6$(l)) = –3264.6 kJ/mol $CH(C(s))$ = –393.5 kJ/mol $fH(H_2O(l))$ = –285.83 kJ/mol