JEE MAIN 2023 ONLINE 25TH JANUARY EVENING SHIFT
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Match List I with List II
| List I | List II | ||
|---|---|---|---|
| A. | Troposphere | I. | Approximate 65-75 km over Earth's surface |
| B. | E-Part of Stratosphere | II. | Approximate 300 km over Earth's surface |
| C. | F\(_2\)-Part of Thermosphere | III. | Approximate 10 km over Earth's surface |
| D. | D-Part of Stratosphere | IV. | Approximate 100 km over Earth's surface |
Choose the correct answer from the options given below :
Given below are two statements :
Statement I : In froth floatation method of rotating paddle agitates the mixture to drive air out of it.
Statement II : Iron pyrites and generally avoided for extraction of iron due to environmental reasons.
In the light of the above statements, choose the correct answer from the options given below :
Let \(\Delta ,\nabla \in \{ \wedge , \vee \}\) be such that \(\mathrm{(p \to q)\Delta (p\nabla q)}\) is a tautology. Then
A train blowing a whistle of frequency 320 Hz approaches an observer standing on the platform at a speed of 66 m/s. The frequency observed by the observer will be (given speed of sound = 330 ms\(^{-1}\)) __________ Hz.
Which one among the following metals is the weakest reducing agent?
Let \(\overrightarrow a = - \widehat i - \widehat j + \widehat k,\overrightarrow a \,.\,\overrightarrow b = 1\) and \(\overrightarrow a \times \overrightarrow b = \widehat i - \widehat j\). Then \(\overrightarrow a - 6\overrightarrow b\) is equal to :