List of practice Questions

The incorrect statement about amylose is:
The IUPAC name of the following compound is
7-Bromo-5-ethyl-2-methyldec-5-en-4-ol
Identify the correct statements from the following (only one):
I) Sulphur sol is an example of multimolecular colloid.
II) Starch sol is an example of associated colloid.
III) Artificial rubber is an example of macromolecular colloid.
Which of the following statements is incorrect with reference to alkaline earth metals?
Consider the following statements:
Statement-I: The order of electronegativity of B, Al, In, Tl is \(B>Tl>Al>In\)
Statement-II: Boric acid is a weak protic acid
Which of the following does not exist?
Consider the following:
Assertion (A): CO is poisonous to living beings
Reason (R): CO binds to hemoglobin forming carboxyhaemoglobin, which is less stable than oxygen-hemoglobin complex.
Consider the following reaction sequence:
Vinylbenzene \(\xrightarrow{KMnO_4 + KOH, \Delta}\) X \(\xrightarrow{NaOH + CaO, \Delta}\) Y
'Y' can also be formed from
Consider the following statements:
Statement-I: If the intermolecular forces are stronger than thermal energy, the substance prefers to be in gaseous state.
Statement-II: Among all elements, the total number of elements available as gases at room temperature is 10.
At 273 K the maximum work done when pressure on 10 g of hydrogen is reduced from 10 atm to 1 atm under isothermal, reversible conditions is
At temperature \(T(K)\), the solubility product of AgBr is \(4 \times 10^{-13}\). What is its solubility in 0.1 M KBr solution?
The voltage gains of two amplifiers connected in series are 8 and 12.5. If the voltage of the input signal is 200 \(\mu V\), then the voltage of the output signal is
If the sum of heights of transmitting and receiving antennas in line of sight communication is \(h\), then the height of receiving antenna, to have the range maximum is
When a metal surface is irradiated with light of frequency \( \nu \) Hz, the kinetic energy of emitted photoelectrons is \( x \) J. When the same metal is irradiated with light of frequency \( y \) Hz, the kinetic energy of emitted electrons is \(\frac{z}{3}\) J. What is the threshold frequency (in Hz) of the metal?
Identify the correct statements from the following:
I) Isotopes of an element show different chemical behaviour
II) Lyman series of lines of hydrogen spectrum appear in UV region
III) The oscillating electric and magnetic field components of electromagnetic radiation are perpendicular to each other and both are perpendicular to the direction of propagation of radiation
In which of the following intramolecular H-bonding is absent?
Options:
- Salicylic acid
- Salicylaldehyde
- Quinol
- Catechol
Identify the correct set of molecules with zero dipole moment.
If the magnetic field inside a solenoid is \(B\), then the magnetic energy stored in it per unit volume is (\(c\) - speed of light in vacuum and \(\epsilon_0\) is permittivity of free space)
The resonant frequency of an LC circuit is \( f_0 \). If a dielectric slab of constant 16 is inserted completely between the plates of the capacitor, then the resonant frequency is
In a plane electromagnetic wave, the magnetic field is given by \(\mathbf{B} = 3 \times 10^{-7} \sin (100 \pi x + 10^{12} t)\, T\), then the wavelength of the wave is (In the equation \(x\) is in metre and \(t\) is in seconds)
If the linear momentum of a proton is changed by \(p_0\), then the de Broglie wavelength associated with the proton changes by 0.25%. Then the initial linear momentum of the proton is
An element X of a half-life of \(1.4 \times 10^9\) years decays to form another stable element Y. A sample is taken from a rock that contains both X and Y in the ratio 1 : 7. If at the time of formation of the rock, Y was not present in the sample, then the age of the rock in years is
A Zener diode of breakdown voltage 20 V is connected as shown in the given circuit. The current through Zener diode is
A Zener diode of breakdown voltage 20 V
Three point charges shown in the figure lie along a straight line. The energy required to exchange the position of central charge with one of the negative charges is
Three point charges shown in the figure lie along a straight line.
A capacitor of capacitance 2\(\mu\)F is charged to 50 V and then disconnected from the source. Later the gap between the plates of the capacitor is filled with a dielectric material. If the energy stored in the capacitor is decreased by 25% of its initial value, then the dielectric constant of the dielectric material is