MCQ
Black Hole is
  • A
    super surface of atmosphere
  • B
    ozone layer
  • super dense planetary material
  • D
    none of these

Answer

Correct option: C.
super dense planetary material
c
Black hole is a super dense planetary material formed due to the continued compression of the core of a star during supernova explosion.

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

In a simple harmonic motion:
  1. The potential energy is always equal to the kinetic energy.
  2. The potential energy is never equal to the kinetic energy.
  3. The average potential energy in any time interval is equal to the average kinetic energy in that time interval.
  4. The average potential energy in one time period is equal to the average kinetic energy in this period.
Force constant of a spring is $K$ . If half part is detached then force constant of the remaining spring will be
In an experiment to determine the period of a simple pendulum of length $1\, m$, it is attached to different spherical bobs of radii $r_1$ and $r_2$ . The two spherical bobs have uniform mass distribution. If the relative difference in the periods, is found to be $5\times10^{-4}\, s$, the difference in radii, $\left| {{r_1} - {r_2}} \right|$ is best given by .... $cm$
Let the moment of inertia of a hollow cylinder of length $30\, cm$ (inner radius $10\, cm$ and outer radius $20\, cm$), about its axis be $I$. The radius of a thin cylinder of the same mass such that its moment of inertia about its axis is also $I$, is ......... $cm$.
The total energy radiated from a black body source is collected for one minute and is used to heat a quantity of water. The temperature of water is found to increase form ${20^o}C$ to ${20.5^o}C$. If the absolute temperature of the black body is doubled and the experiment is repeated with the same quantity of water at ${20^o}C$, the temperature of water will be....... $^oC$
Which of the following pairs of physical quantities may be represented in the same unit?
  1. Heat and temperature.
  2. Temperature and mole.
  3. Heat and work.
  4. Specific heat and heat.
The force constant of a wire is $k$  and that of another wire is $2k.$ When both the wires are stretched through same distance, then the work done
The sun radiates electromagnetic energy at the rate of $3.9 \times 10^{26}\,W$. It's radius is $6.96 \times 10^8\,m$. The intensity of sun light at the solar surface will be (in $W/m^2$)
The maximum horizontal range of a projectile is $160\, m$. When the projectile is thrown  with the same speed at an elevation of $30^o$ from the horizontal, it will reach to the  maximum height of   ......... $m$
A missile is fired for maximum range at your town from a place $100\, km$ away from you. If the missile is first detected at its half way point, how much warning time will you have ? (Take $g = 10\, m/s ^2$) the maximum height of the missile is