List of practice Questions

The energy of a photon of wavelength $?$ is
Silk thread is obtained from silk moth during
RNA does not possess
Keto-enol tautomerism is observed in
Calorific value is in order
Which one is formed when sodium phenoxide is heated with ethyl iodide?
Which meristem helps in increasing girth?
What is the weight of oxygen required for the complete combustion of 2.8 kg of ethylene?
Lucas reagent is
If formaldehyde and KOH are heated then we get
If $C$ and $R$ denote capacitance and resistance, the dimensional formula of $CR$ is
Formalin is an aqueous solution of
A boat which has a speed of $5\, km/h$ in still water crosses a river of width $1\, km$ along the shortest possible path in $15\, min$. The velocity of the river water in $km/h$ is
The $ pK_a$ of acetyl salicylic acid (aspirin) is 3.5. The pH of gastric juice in human stomach is about 2-3 and the pH in the small intestine is about 8. A spirin will be
The oxidation number of phosphorus in Ba(H$_2PO_2 )_2$ is
The number of structural and configurational isomers of a brorno compound, $C_5 H_9 Br,$ formed by the addition of HBr to 2-pentyne respectively, are
Sum of the first n terms of the series $\frac{1}{2} + \frac{3}{4} + \frac{7}{8} + \frac{15}{16} + ...$ is equal to
Potassium manganate $(K_2MnO_4)$ is formed when
One hundred identical coins, each with probability p, of showing up heads are tossed once. If $0 < p < 1$ and the probability of heads showing on 50 coins is equal to that of heads showing on 51 coins, then the value of p is
For two given events $A$ and $B, P(A \cap B) $ is
The equations of the tangents drawn from the origin to the circle $x^2 + y^2 + 2 rx + 2hy + h^2 = 0, $ are
The value of the expression $\sqrt{3} cosec 20^\circ -sec 20^\circ $is equal to
Prove that the value of the integral, $\int\limits_0^{2a} [f(x)/ f(x) + f(2a-x)] dx$ is equal to a
If the first and the $ (2n - 1)th$ term of an $AP, GP$ and $HP$ are equal and their nth terms are $a, b$ and $c$ respectively, then
If $ y^2 = P (x) $ is a polynomial of degree 3, then $2 \frac{d}{dx} \bigg(y^3 \frac{d^2 \, y}{ dx^2}\bigg) $ equals