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In which of the following pairs of molecules/ions, the central atoms have $sp^2$ hybridization?
In which of the following processes, heat is neither absorbed nor released by a system?
In which of the following compounds is an intramolecular hydrogen bond present?
The two nearest harmonics of a tube closed at one end and open at the other end are $220 \text{ Hz}$ and $260 \text{ Hz}$. What is the fundamental frequency of the system?
Which of the following has the minimum bond length?
Progesterone alone or in combination with estrogen can also be used as contraceptives by females as injections or implants under their skin. When used in this manner, they:
Identify the wrong statement with regard to Restriction Enzymes.
A transverse wave propagating along the $x$-axis is represented by: $y(x,t) = 8.0\sin(0.5\pi x - 4\pi t - \frac{\pi}{4})$, where $x$ is in meters and $t$ in seconds. The speed of the wave is:
Among the following, the pair in which the two species are not isostructural is:
Perigynous flowers are found in:
In some plants, the female gamete develops into an embryo without fertilization. This phenomenon is known as:
Which of these following methods is the most suitable for disposal of nuclear waste?
For the gas phase reaction, $\text{PCl}_5\text{(g)} \rightleftharpoons \text{PCl}_3\text{(g)} + \text{Cl}_2\text{(g)}$, which of the following conditions is correct?
When phenol is treated with CHCl₃ and NaOH, the product formed is:
In Drosophila, the genes for color of body and color of eyes are situated on _______.
One mole of an ideal gas at $300\text{ K}$ is expanded isothermally from an initial volume of $1\text{ litre}$ to $10\text{ litres}$. The $\Delta E$ for this process is: ($R = 2\text{ cal mol}^{-1}\text{K}^{-1}$)
The maximum elongation of a steel wire of $1 \text{ m}$ length if the elastic limit of steel and its Young's modulus, respectively, are $8 \times 10^8 \text{ N m}^{-2}$ and $2 \times 10^{11} \text{ N m}^{-2}$, is:
The half-life of a radioactive nuclide is 100 hours. The fraction of original activity that will remain after 150 hours would be
Match Column - I with Column - II Column - I Column - II (a) Saprophyte (i) Symbiotic association of fungi with plant roots (b) Parasite (ii) Decomposition of dead organic materials (c) Lichens (iii) Living on living plants or animals (d) Mycorrhiza (iv) Symbiotic association of algae and fungi Choose the correct answer from the option given below (a) (b) (c) (d) (1) (i) (ii) (iii) (iv) (2) (iii) (ii) (i) (iv) (3) (ii) (i) (iii) (iv) (4) (ii) (iii) (iv) (i)
What is true about "Saheli"? I: Developed at the CDRI, Lucknow II: Contains a steroidal preparation III: "Once-a-week" pill IV: Many side-effects V: High contraceptive value VI: Very few side-effects