MCQ
Radioactivity is:
- AIreversible process.
- BSelf disintegration process.
- CSpontaneous.
- ✓All of the above.
✓
Answer
Correct option: D.
All of the above.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
The ratio of radii of nuclei $13^{\mathrm{Al}^{27}}$ and $52^{x^A}$ is 3 : 5. The number of neutrons in the nuclei of X will be
→A conducting bar $PQ$ of length $l$ carrying current $I$ is suspended from a rigid support as shown in figure. A uniform magnetic field $B$ perpendicular to $PQ$ and directed away from the reader (inside the plane) is applied. If the mass of the bar is $M$ the tension in each string is
→Two resistors $400\, \Omega$ and $800\, \Omega$ are connected in series across a $6 V$ battery. The potential difference measured by a voltmeter of $10\, k \Omega$ across $400\, \Omega$ resistor is close to$....V$
→A $2\,meter$ long scale with least count of $0.2\,cm$ is used to measure the locations of objects on an optical bench. While measuring the focal length of a convex lens, the object pin and the convex lens are placed at $80\,cm$ mark and $1\,m$ mark, respectively. The image of the object pin on the other side of lens coincides with image pin that is kept at $180\,cm$ mark. The $\%$ error in the estimation of focal length is
→The potential at a point $x$ (measured in $μ\ m$) due to some charges situated on the $ x$-axis is given by $V(x)$ =$\frac{{20}}{{{x^2} - 4}}$ $volt$ The electric field $E$ at $x = 4\ μ m$ is given by
→Match List$-I$ with List$-II$
→| List$-I$ | List$-II$ |
| $A$ Gauss's Law in Electrostat ics | $I$ $\oint \vec{E} \cdot d \vec{l}=-\frac{d \phi_B}{d t}$ |
| $B$ Faraday's Law | $II$ $\oint \overrightarrow{ B } \cdot d \overrightarrow{ A }=0$ |
| $C$ Gauss's Law in Magnetism | $III$ $\oint \vec{B} \cdot d \vec{l}=\mu_0 i_C+\mu_0 \in_0 \frac{d \phi_E}{d t}$ |
| $D$ Ampere-Maxwell Law | $IV$ $\oint \overrightarrow{ E } \cdot d \overrightarrow{ s }=\frac{ q }{\in_0}$ |
Choose the correct answer from the options given below:
On increasing the number of electrons striking the anode of an X-ray tube, which one of the following parameters of the resulting X-rays would increase
Relation between critical angles of water and glass is
The far point of a near sighted person is $6.0\, m$ from his eyes and she wears contacts that enable her to see distant objects clearly. A tree is $18.0\, m$ away and $2.0\, m$ high. How high is the image formed by the contacts ?.......$m$
→In a Wheatstone bridge, $P = 90\,\Omega $, $Q = 110\,\Omega $ , $R = 40\,\Omega $ and $S = 60\,\Omega $ and a cell of $4\,V\,emf$. Then the potential difference between the diagonal along which a galvanometer is connected is ............. $V$
→