Which of the following statements is false regarding the properties of electromagnetic waves?
- ABoth electric and magnetic field vectors attain the maxima and minima at the same place and same time.
- BThe energy in an electromagnetic wave is divided equally between electric and magnetic field vectors.
- CBoth electric and magnetic field vectors are parallel to each other and perpendicular to the direction of propagation of the wave.
- DThese waves do not require any material medium for propagation.
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Which of the following does not show negative deviation from Raoult's law?
$5$ moles of Hydrogen $\left(\gamma=\frac{7}{5}\right)$ initially at $S.T.P.$ are compressed adiabatically so that its temperature becomes $400^{\circ} C$. The increase in the internal energy of the gas in kilo-joules is $(R=8.30 \ J \ mol^{-1} \ K^{-1})$.
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The angle of elevation of an object on a hill is observed from a certain point in the horizontal plane through its base to be $30^{\circ}$. After walking $120 \ m$ towards it on level ground,the angle of elevation is found to be $60^{\circ}$. The height of the object (in metres) is:
Match the corresponding entries of Column-$I$ with Column-$II$. [Where $m$ is the magnification produced by the mirror]
Column-$I$ Column-$II$ $1. m = -2$ $a$. Convex mirror $2. m = -\frac{1}{2}$ $b$. Concave mirror $3. m = +2$ $c$. Real Image $4. m = +\frac{1}{2}$ $d$. Virtual image
| Column-$I$ | Column-$II$ |
| $1. m = -2$ | $a$. Convex mirror |
| $2. m = -\frac{1}{2}$ | $b$. Concave mirror |
| $3. m = +2$ | $c$. Real Image |
| $4. m = +\frac{1}{2}$ | $d$. Virtual image |
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