List of practice Questions

Three plants, Mustard, Calotropis, and Guava, are collected. There are 30 nodes in Mustard, 30 nodes in Calotropis, 25 nodes in Guava are present. Find the number of leaves put together in all three plants?
Choose the plants from the given list which have hypogynous flowers.
Mustard, Cucumber, Brinjal, Plum, Rose, Peach, Guava, Sunflower, and China Rose.
Assertion (A): Algae will increase the level of dissolved oxygen in the immediate environment.
Reason (R): They form the food for aquatic animals.
Identify the correct option from the following:
Choose the incorrect statement among the following:
I. The present era is called “Golden era of Biology”.
II. Sexual system of classification was proposed by Theophrastus.
III. Study of Amphibians of plant kingdom are called Bryology.
IV. Recycling of nutrients takes place by parasitic petrophants.
Among the following fungi, which are placed under class Deuteromycetes?
(Alternaria, Aspergillus, Mucor, Claviceps, Penicillium, Trichoderma, Colletotrichum, Ustilago, Polyporus, Puccinia, Agaricus, Neurospora, Albugo, and Rhizopus)
In Herbarium sheets, label provides information about
The disease caused by deficiency of pyridoxine is:
The ore, concentrated by froth floatation process is:
Which one of the following oxidizes manganous salt to permanganate in aqueous solution?
Which of the following is a non-reducing sugar?
Consider the following cell at 298 K:
\[ {Mg(s)} | {Mg}^{2+}(x M) || {Zn}^{2+}(y M) | {Zn(s)} \] The cell reaction reached the equilibrium state. What is the value of \(\log \frac{[{Mg}^{2+}]}{[{Zn}^{2+}]}\)? Given: \[ E^\circ_{{Mg}^{2+}/{Mg}} = -2.36\, V; E^\circ_{{Zn}^{2+}/{Zn}} = -0.76\, V; \frac{2.303 RT}{F} = 0.06\, V \]
Which of the following is the most effective protective colloid on the basis of gold number values?
Consider the following:
Statement-I: The charge on colloidal particle can be confirmed by electrophoresis experiment.
Statement-II: Whipped cream is an example of Aerosol. The correct answer is:
The enthalpy of atomization of \({CH}_3{NH}_2(g)\) is 2313 kJ mol\(^{-1}\). If \(\Delta_{{C-H}}^{\ominus}\) and \(\Delta_{{N-H}}^{\ominus}\) are 414 and 389 kJ mol\(^{-1}\) respectively, then \(\Delta_{{C-N}}^{\ominus}\) (in kJ mol\(^{-1}\)) will be:
The value of \(\Delta_r H\) for the reaction:
\[ {N}_2{O}_4(g) + 3 {CO}(g) \rightarrow {N}_2{O}(g) + 3 {CO}_2(g) \] (in kJ) is:
(Given: Enthalpies of formation in kJ mol\(^{-1}\) are \({CO}(g) = -110\), \({CO}_2(g) = -393\), \({N}_2{O}(g) = 81\), and \({N}_2{O}_4(g) = 9.7\))
If a linear antenna radiates a power \(P\) at a wavelength \(\lambda\), then the power radiated by the same antenna at a wavelength of \(\frac{\lambda}{\sqrt{3}}\) is:
If the kinetic energy of a particle having wavelength \(x \, {\AA}\) is increased to three times, its de Broglie wavelength (in {\AA}) is:
From the following identify the change in which electron gain enthalpy is positive. (g = gas phase):
If an inductor of inductance \(0.5 \, \mu H\) is connected to an AC source of frequency 70 MHz and voltage 3.3 V, then the current through the inductor is:
Two cells of each emf \(1.5\,{V}\) and internal resistance \(1\,\Omega\) are first connected in series to an external resistance \(R\), and then the cells are connected in parallel to the same resistance. If the ratio of the potential differences across \(R\) in the two cases is \(4:3\), then the value of \(R\) is:
If a sound wave emitted by a stationary source of frequency 680 Hz travels towards a stationary observer 150 m away, then the number of waves between the source and observer are (speed of sound in air = 340 m s\(^{-1}\))
A source of light approaching the Earth emits a light of wavelength \(600\, {nm}\). If this light is observed at a wavelength of \(599\, {nm}\) by an observer on Earth, then the speed of the source of light in km/s is: \[ {(speed of light in vacuum } c = 3 \times 10^8 \, {m/s)} \]
If an electric generator produces a potential difference of \(180\,{kV}\) in a spark of length \(9\,{cm}\), then the maximum electric field generated is:
The efficiency of a Carnot engine operating between the temperatures 1000 K and 300 K is
The slope of kinetic energy (on y-axis) and linear displacement (on x-axis) graph of a body gives the rate of change of: