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List of top Questions asked in NEET 2019

If $P$ and $Q$ are symmetric matrices of the same order then $PQ - QP$ is
If the sum of n terms of an A.P is given by $S_n = n^2 + n$, then the common difference of the A.P is
If f(x) = $\sin^{-1}$ $\left(\frac{2x}{1+x^{2}}\right)$, then f' $(\sqrt{3})$ is
The locus represented by $xy + yz = 0$ is
Let $P=[a_{ij}]$ be a $3\times3$ matrix and let $Q=[b_{ij}]$ where $b_{ij}=2^{i+j} a_{ij}$ for $1 \le i, j \le $.If the determinant of $P$ is $2$, then the determinant of the matrix $Q$ is
If $2^x+2^y = 2^{x+y}$, then $\frac {dy}{dx}$ is
0.2% solution of phenol is ___________while its 1% solution is________
When a light ray enters from oil to glass on oilglass interface. Velocity of light changes by a factor of: $\left(\mu_{oil}=2,\,\mu_{glass}=3/2\right)$
The given combination will work as:
Find the position of final image from first lens.If the focal length of each lens is 10 cm.
Two identical thin plano-convex glass lenses (refractive index 1.5) each having radius of curvature of 20 cm are placed with their convex surfaces in contact at the centre. The intervening space is filled with oil of refractive index 1.7. The focal length of the combination is
Work done in turning a magnet of magnetic moment M by an angle of 90º from the mgnetic meridian is n times the corresponding work done to turn through an angle of 60º, where n is
If same charge 'q' is placed inside a sphere and cube, having radius 1 m and side 2 m respectively. What will be the ratio of flux passing through them:
Induction furnace uses ______ to produce heat
Find amount of charge flown from Y to X when switch S is closed.
The refractive index of a particular material is $1.67$ for blue light, $1.65$ for yellow light and $1.63$ for red light. The dispersive power of the material is .........
0.2 moles of an ideal gas is taken round the cycle ABC as shown in the figure. The path B → C is an adiabatic process, A → B is an isochoric process and C → A is an isobaric process. The temerature at A and B are T = 300 K and T = 500 K and pressure at A is 1 atm and volume at A is 4.9 L. The volume at C is (Given : $\gamma=\frac{Cp}{C_{V}}=\frac{5}{3}, R = 8.205 × 10^{-2}$ L atm mol$^{-1}$ $K^{-1}, \left(\frac{3}{2}\right)^{^{2/5}} =0.81$
A screw gauge has least count of 0.01 mm and there are 50 divisions in its circular scale. The pitch of the screw gauge is:
For which one of the following, Bohr model is not valid?
A body weighs 72 N on the surface of the earth. What is the gravitational force on it, at a height equal to half the radius of the earth?
The energy equivalent of 0.5 g of a substance is:
Two cylinders $A$ and $B$ of equal capacity are connected to each other via a stop clock. A contains an ideal gas at standard temperature and pressure. $B$ is completely evacuated. The entire system is thermally insulated. The stop clock is suddenly opened. The process is:
The Brewsters angle $i_b$ for an interface should be:
A cylinder contains hydrogen gas at pressure of 249 kPa and temperature $27^\circ\,C$. Its density is :$(R = 8.3\,J\,mol^{-1}K^{-1}$)
The solids which have negative temperature coefficient of resistance are :

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