MCQ
Black hole is a
  • A
    Hole in the ozone layer of atmosphere
  • B
    Hole in earth's centre
  • Highly dense matter available in the atmosphere
  • D
    Hole in troposphere

Answer

Correct option: C.
Highly dense matter available in the atmosphere
Black hole is highly dense malter in the atmosphere which has very large value of gravitational pull, so that nothing escapes from it.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Similar questions

Wires $A$ and $B$ have identical lengths and have circular crosssections. The radius of $A$ is twice the radius of $B$ i.e. $r_A=2 r_B$. For a given temperature difference between the two ends, both wires conduct heat at the same rate. The relation between the thermal conductivities is given by
$X$ rays cannot be deflected by means of an ordinary grating due to
A cylinder containing water up to a height of $25 cm$ has a hole of cross-section $\frac{1}{4} cm ^2$ in its bottom. It is counterpoised in a balance. What is the initial change in the balancing weight when water begins to flow out
Image
Deviation of $5^{\circ}$ is observed from a prism whose angle is small and whose refractive index is $1.5.$ The angle of prism is
A ball of mass $10 \mathrm{~kg}$ is moving with a velocity of $10 \mathrm{~m} / \mathrm{s}$. It strikes another ball of mass $5 \mathrm{~kg}$ which is moving in the same direction with a velocity of $4 \mathrm{~m} / \mathrm{s}$. If the collision is elastic, their velocities after the collision will be, respectively
The position $x$ of a particle varies with time $t$ as $x=a t^2-b t^3$. The acceleration of the particle will be zero at time $t$ equal to
When a piece of aluminium wire of finite length is drawn through a series of dies to reduce its diameter to half its original value, its resistance will become
The surface tension for pure water in a capillary tube experiment is
If an electron and a photon propagate in the form of waves having the same wavelength, it implies that they have the same
A rectangular block is $5 cm \times 5 cm \times 10 cm$ in size. The block is floating in water with $5 cm$ side vertical. If it floats with $10 cm$ side vertical, what change will occur in the level of water?