Which one of the following types of waves are used in a night vision apparatus?

To meet its rapidly growing energy demand, some opine that India should pursue research and development on thorium as the future fuel of nuclear energy. In this context, what advantage does thorium hold over uranium?

1. Thorium is far more abundant in nature than uranium.

2. On the basis of per unit mass of mined mineral thorium can generate more energy compared to natural uranium.

3. Thorium produces less harmful waste compared to uranium.

Which of the statements given above is/are correct?

Consider the following statements:

Statement I

In the process ${}_1{}^{3}T\to {}_2{}^{3}He+X$, $X$ is electron.

Statement II

In the transformation sequence ${}_Z{}^{A}X\to {}_{Z-2}{}^{A-4}Y\to {}_{Z-2}{}^{A-4}Z\to {}_{Z-1}{}^{A-4}K$.

The decays in the order $\alpha , \gamma , \beta$.

Consider the following statements:

Statements I : In the visible spectrum of light red light is more energetic than green light.

Statements II : The wavelength of red light is more than that of green light.

Which of the statements given above is/are correct?

A person in a spaceship located halfway between the earth and the sun will notice that the:

1. The sky is jet black.

2. Stars do not twinkle.

3. The temperature outside the spaceship is much higher than that on the surface of the earth.

Which of the statements given above is/are correct?

Which are the materials generally employed as solder in soldering operations in electronics?

Consider the following statements:

Statement I: In nuclear reaction there is the conservation of mass-energy only.

Statement II: γ-rays are having the most penetrating power.

Statement III: Nuclear force is a long-range force.

Statement IV: Gamma rays are fast-moving electron.

Which of the statements given above is/are correct?

Consider the following statements:
$1.$ Energy is continuously created in the sun due to nuclear fusion.
$2.$ Cadmium is a radioactive element.
$3.$ The photoelectric effect is based on the particle nature of light.
$4.$ Cathode rays are not affected by the magnetic field.

Which of the statements given above are correct?

Consider the following statements:

$1.$ In a semiconductor, the uppermost band is the valence band.

$2.$ All semiconductors are electrically neutral.

$3.$ With an increase of temperature, the resistivity of a semiconductor decreases.

$4.$ Addition of a small amount of impurity of an III or V group element to a pure semiconductor increases its resistivity.

Choose the correct statements.