Physics - Study Mode

[#591] X–rays are
Correct Answer

(C) Neutral particles

Explanation

Solution: X–rays are neutral particles.

[#592] X-rays region lies between
Correct Answer

(C) Gamma-rays and ultraviolet region

Explanation

Solution: X-rays region lies between gamma rays and ultraviolet region.

[#593] In the absence of ozone layer, which rays will enter into atmosphere?
Correct Answer

(C) Ultraviolet

Explanation

Solution: The ozone layer is a layer in Earth’s atmosphere containing relatively high concentrations of ozone (O3). The ozone layer absorbs 97–99% of the Sun’s medium frequency ultraviolet light (from about 200 nm to 315 nm wavelength), which potentially damages exposed life forms on Earth. Although the concentration of the ozone in the ozone layer is very small, it is vitally important to life because it absorbs biologically harmful ultraviolet (UV) radiation coming from the sun. Extremely short or vacuum UV (10-100 nm) is screened out by nitrogen.

[#594] In MRI machine, which one of the following is used?
Correct Answer

(D) Magnetic wave

Explanation

Solution: Magnetic resonance imaging (MRI), nuclear magnetic resonance imaging (NMRI), or magnetic resonance tomography (MRT) is a medical imaging technique used in radiology to visualize internal structures of the body in detail. MRI makes use of the property of nuclear magnetic resonance (NMR) to image nuclei of atoms inside the body. An MRI scanner is a device in which the patient lies within a large, powerful magnet where the magnetic field is used to align the magnetization of some atomic nuclei in the body, and radio frequency fields to systematically alter the alignment of this magnetization. This causes the nuclei to produce a rotating magnetic field detectable by the scanner—and this information is recorded to construct an image of the scanned area of the body.

[#595] Fuse wire is made of an alloy of
Correct Answer

(A) Tin and Lead

Explanation

Solution: An electrical fuse is a safety device in the circuit that protects electrical systems by breaking the connection when a short circuit is occurring. The fuse wire is made up of Sn (tin) and Pb (lead) alloy because of its high resistance and low melting point.