List of top Questions asked in AP ECET ECE- 2025

The number of common tangents to the circles $x^2 + y^2 - x = 0$ and $x^2 + y^2 + x = 0$ is
The centre and radius of the circle $x^2 + y^2 - 4x - 8y - 41 = 0$ are
If two rows (or columns) of a determinant of order 3 are identical then the value of determinant is
Order of the matrix $\begin{bmatrix} 1 & 6 \\ 2 & 0 \\ 7 & -1 \end{bmatrix}$ is
In part of the atmosphere ozone layer is present.
pH of acid rain water is generally in the range of
Which of the following is NOT regarded as a primary fuel?
The correct structure of neoprene rubber is
Bakelite is an example of
The monomer of Teflon is X. The number of fluorine atoms in X is
Rust is chemically
Statement I: The lower the pH greater is the corrosion.
Statement II: Electrochemical Corrosion always occurs at the anodic area.
$27.2$ mg of $CaSO_4$ and $2.4$ mg of $MgSO_4$ are present in a $2$ kg water sample. What is the total hardness of water (in ppm) in terms of equivalents of $CaCO_3$? (molecular weight of $CaSO_4 = 136$ & molecular weight of $MgSO_4 = 120$)
Exhausted permutit is regenerated by washing with
With which of the following anions, $Mg^{2+}$ and $Ca^{2+}$ ions form salts responsible for permanent hardness of water?
If the standard reduction potentials of A, B, C are respectively $0.68\text{V}$, $-2.54\text{V}$ and $-0.50\text{V}$, then the order of their reducing power is
What is the emf of the cell? $Sn|Sn^{2+} (1\text{M}) || Ag^+ (1\text{M}) | Ag$ [Given $E^0_{Sn^{2+}/Sn} = -0.14\text{V}$ and $E^0_{Ag^+/Ag} = +0.80\text{V}$]
The amount of substance deposited due to passage of $1\text{F}$ of electricity is called
A current of $0.5\text{ amp}$ is passed through molten $AlCl_3$ for $96.5\text{ seconds}$. The volume of $Cl_2$ gas liberated at STP at anode (in ml) is ($Cl = 35.5\text{ u}$) ($1F = 96500 \text{ C mol}^{-1}$)
Which of the following combinations give a buffer solution?
At $25^\circ\text{C}$, ionic product ($K_w$) of $0.01\text{M HCl}$ solution is
The equivalent weight of which of the following is the highest?
A gaseous mixture contains $8\text{ g}$ of oxygen, $14\text{ g}$ of nitrogen and $8\text{ g}$ of hydrogen. Total number of molecules present in the gaseous mixture is (Given: At. wt: $H=1$, $N=14$, $O=16$, $N_A = 6 \times 10^{23} \text{ mol}^{-1}$)
How many grams of $NaOH$ is required to prepare $5.0$ litre of $0.1\text{ N}$ solution? (Given: At. wt: $H=1$, $O=16$, $Na=23$)
The sum of covalent bonds in $H_2$, $N_2$ and $HCl$ is