Each side of a metallic cube of mass 5.580 kg is measured to the 9.0 cm . Keeping the significant figures in view, the density of the material of the cube can be best expressed as $X \times 10^3 \mathrm{~kg} \mathrm{~m}^{-3}$ where the value of $X$ is:
7.654
7.6
7.65
7.7
The following plots show variation of velocity $(v)$ with time $(t)$ of a ball thrown vertically upward, and falling back. Which of the following plots is/are correct?

C only
D only
B only
A and E only
The sum of kinetic energy and potential energy of a simple pendulum bob is 0.02 joule. The speed of the simple pendulum bob at equilibrium position is approximately:
(Consider mass of the bob $=20 \mathrm{~g}$ )
$0.2 \mathrm{~m} / \mathrm{s}$
$1.41 \mathrm{~m} / \mathrm{s}$
$14.1 \mathrm{~m} / \mathrm{s}$
$2.0 \mathrm{~m} / \mathrm{s}$
In Young's double slit experiment, using monochromatic light of wavelength $\lambda$, the intensity of light at a point on the screen where the path difference is $\lambda$, is $K$ units. The intensity of light at a point where the path difference is $\frac{\lambda}{3}$ will be
$\frac{K}{4}$
K
$2 K$
$\frac{K}{2}$
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