Question

Assertion  : Amongst alpha, beta and gamma rays, a-particle has maximum penetrating power.

Reason      : The alpha particle is heavier than beta and gamma rays.

(a) If both assertion and reason are true and the reason is the correct explanation of the assertion.

(b) If both assertion and reason are true but reason is not the correct explanation of the assertion.

(c) If assertion is true but reason is false.

(d) If the assertion and reason both are false.

Answer

(d) If the assertion and reason both are false.

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

What is the angle between the electric dipole moment $\vec{p}$ and the electric field strength $\vec{E}$ when the dipole is in a stable equilibrium ?

In the diagram shown, the reading of voltmeter is 20 V and that of ammeter is 4 A. The value of R should be (Consider given ammeter and voltmeter are not ideal)

(a) Equal to 5Ω

(b) Greater from 5 Ω

(c) Less than 5 Ω

(d) Greater or less than 5 Ω  depends on the material of R

When the wave of hydrogen atom comes from infinity into the first orbit then the value of wave number is

(a) 109700 cm–1

(b) 1097cm–1

(c) 109 cm–1

(d) None of these

Let r be the distance of a point on the axis of a bar magnet from its centre. The magnetic field at such a point is proportional to:

  1. $\frac{1}{\text{r}}$

  2. $\frac{1}{\text{r}^2}$

  3. $\frac{1}{\text{r}^3}$

  4. None of these.

Two streams of electrons are moving parallel to each other in the same direction. They_____.

A combination of two thin lenses of the same material with focal lengths  and , arranged on a common axis minimizes chromatic aberration, if the distance between them is

(a)  

(b)

(c) ( 

(d)  

A proton and an electron are accelerated by the same potential difference. Let $\lambda_\text{e}$ and $\lambda_\text{p}$ denote the de Broglie wavelengths of the electron and the proton respectively.

  1. $\lambda_\text{e}=\lambda_\text{p}.$

  2. $\lambda_\text{e}<\lambda_\text{p}.$

  3. $\lambda _\text{e}>\lambda_\text{p}.$

  4. The relation between $\lambda_\text{e}$, and $\lambda_\text{p}$ depends on the accelerating potential difference.

Which of the following is not according to addition law of binary digits ?
The source of stellar energy is:
The direction of electric field is from: