List of practice Questions

In hemoglobin the metal ion present is

Figure shows a straight wire length $l$ carrying current $i$. The magnitude of magnetic field produced by the current at point $P$ is.

Nitrobenzene can be converted into azobenzene by reduction with

For what values of m can the expression $2x^2 + mxy + 3y^2 - 5y - 2$ be expressed as the product of two linear factors

Experimental investigations show that the intensity of solar radiation is maximum for a wavelength $480 \,nm$ in the visible region. Estimate the surface temperature of sun. (Given Wien's constant $b = 2.88\times10^{-3} \,mK.)$

Enthalpy of a compound is equal to its

The reading of the ammeter in the following figure will be

If $x_1$ be the size of the magnified image and $x_2$ the size of the diminished image in Lens Displacement Method, then the size of the object is

Compound formed by electrolysis of a mixture of ethanol and NaCl is

A solution of sucrose (molar mass = $342 \,g \,mol^{-1}$) has been prepared by dissolving $68.5 \,g$ of sucrose in $1000 \,g$ of water. The freezing point of the solution obtained will be ($K_f$ for water = $1.86 \, K \, kg \, mol^{-1}$)

There are a $25\, W -220\, V$ bulb and a $100\, W-220\, V$ line. Which electric bulb will glow more brightly?

$AB$ crystallizes in a body centred cubic lattice with edge length 'a' equal to $387 \,pm$. The distance between two oppositely charged ions in the lattices is

The value of $\frac{2}{3!}+\frac{4}{5!}+\frac{6}{7!}+........$ is

Which of the following converts $CH_3CONH_2$ to $CH_3NH_2$ ?

Which of the following is a Gattermann aldehyde synthesis?

Two light sources are said to be coherent if they are obtained from

Which of the following rays is emitted by a human body?

Zener diode is used for

For the current loops shown in the figure, Kirchhoff's loop rule for the loops $A H D C B A$ and AHDEFGA yields these equations respectively

Which of the following does not exihibit the phenomena of mutarotation?

Some of the properties of the two species, $NO_3^-$ and ${H_3O^+}$ are described below. Which one of them is correct?

For transistor action (1) Base, emitter and collector regions should have similar size and doping concentrations. (2) The base region must be very thin and lightly doped. (3) The emitter-base junction is forward biased and base-collector junction is reverse biased. (4) Both the emitter-base junction as well as the base-collector junction are forward biased. Which one of the following pairs of statements is correct?

Bovine spongiform encephalopathy is a disease caused by prions in a.....

According to Darwin, evolution is_______

In the following reaction sequence, $ \ce{CH3CHO ->[Cl_2][Ca(OH)_2] X ->[C_6H_5NH_2][Alc. KOH] Y}$ $Y$ is