List of practice Questions

Which of the following is an example of a positively charged sol?
Copper matte mainly contains
Consider the following:
Statement-I: \( \text{CO}_2 \) is released into atmosphere by burning of fossil fuels and increase in \( \text{CO}_2 \) levels in air causes global warming.
Statement-II: CO is released into the air mainly by automobile exhaust and it is a lung irritant.
Which of the following compounds is most reactive towards electrophilic substitution reactions?
The minimum length of an antenna to transmit a signal of frequency \( 3 \text{ kHz} \) is
The wavelength of spectral line corresponding to electron transition \( n = 3 \) to \( n = 2 \) for \( \text{Li}^{2+} \) ion is \( \lambda \,\text{nm} \). What is the wavelength (in nm) corresponding to electron transition \( n = 4 \) to \( n = 1 \) for \( \text{He}^+ \) ion?
Consider the following:
Statement I: Real gases exhibit ideal behaviour at high pressures and low temperatures.
Statement II: At high pressure, all gases have compressibility factor (Z) either as 1 or< 1.
If a capacitor of 500 nF is connected to an AC source of frequency 1 kHz, then the capacitive reactance of the capacitor is
If the collector and base currents of a transistor in common emitter configuration are 5 mA and 50 \(\mu\)A, then the current amplification factor of the transistor is
In the circuit of resistors shown in the figure, the effective resistance between points A and B is
effective resistance between points A and B is
A spherical black body of radius 12 cm at a temperature of \(T\) K radiates a power of 400 W. If the radius of the sphere is doubled and absolute temperature is halved, then the power radiated by the body is
The focal length of a convex lens immersed in a liquid of refractive index 1.2 is \( f_1 \) and its focal length when immersed in another liquid of refractive index 1.25 is \( f_2 \). If the refractive index of the material of the lens is 1.5, then \( f_1 : f_2 = \)
The capacitance of a solid sphere of radius 18 cm is
Three point charges +10 µC, +20 µC, and +40 µC are placed at the vertices of an equilateral triangle of side 1 m. The electrostatic potential energy of the system of the charges is
If two temperatures on Celsius scale differ by \( 25^\circ \), then the difference of those two temperatures on Fahrenheit scale is
During adiabatic expansion process, if the temperature of 4 moles of a monoatomic gas is decreased by \(100^\circ C\), then the work done by the gas is
(Universal gas constant \(R = 8.3 \, \text{J/mol·K}\))
A body of mass 2 kg starts moving from the origin (0, 0) with an initial velocity of \( (4\hat{i} + 4\hat{j})\ \text{ms}^{-1} \). A constant force of \( -20\hat{j} \ \text{N} \) is applied on the body. When the Y-coordinate of the position of the body becomes zero again, then its X-coordinate is
For a body in simple harmonic motion, the relation between force \( F \) (in Newton) acting on the body and its displacement \( y \) (in metre) is given as \( F + 3y = 0 \). If the time period of oscillation of the body is \( \pi \) s, then its mass is
If the amplitudes of a damped harmonic oscillator at times 3 and 6 seconds are 6 cm and 4 cm respectively, then the initial amplitude of the oscillator is
A person walks up an escalator at rest in a time of 60 s. When standing on the same escalator now moving with a uniform speed, he is carried up in a time of 30 s. The time taken for him to walk up the moving escalator is
If a body is projected horizontally from a height of 50 m with a speed of 20 m/s, then its speed after a time of 1.5 s is
(Acceleration due to gravity \( g = 10\ \text{m/s}^2 \))
Study the following and pick up the correct statements
I) Flagellates exhibit gliding locomotion with the help of their flagellae
II) Multiple fission in Amoeba is called sporulation
III) Syngamy in Plasmodium is hologamy type
IV) Fusion of pronuclei of gametes is called amphimixis
Match the following:
The correct answer is:
Sequence of reagents required to convert m-bromoaniline to benzoic acid is
(dry ether = పొడి ఈథర్)
Which of the following has the lowest $ pK_b $ value?