General Science - Physics for Railway Exams

<p>Radian/second (B)</p> Signup and view all the answers

<p>Coulomb (A)</p> Signup and view all the answers

<p>Length (A)</p> Signup and view all the answers

<p>Kilogram metre per second (A)</p> Signup and view all the answers

<p>It converts pressure variations into electrical signals. (B)</p> Signup and view all the answers

<p>Ultrasonic waves are transmitted, reflected, and detected. (A)</p> Signup and view all the answers

<p>Elevated risk of insomnia. (D)</p> Signup and view all the answers

<p>Pinna (C)</p> Signup and view all the answers

<p>Through roadside plantations. (D)</p> Signup and view all the answers

<p>It quadruples the loudness. (A)</p> Signup and view all the answers

<p>As the amount of sound energy passing each second through unit area. (C)</p> Signup and view all the answers

<p>The speed of sound decreases as it transitions from solid to gas. (C)</p> Signup and view all the answers

<p>Sound speed increases as temperature increases. (B)</p> Signup and view all the answers

<p>Decibel (B)</p> Signup and view all the answers

<p>The speed of sound is largely dependent on temperature. (B)</p> Signup and view all the answers

<p>In steel at high temperature. (C)</p> Signup and view all the answers

<p>The amplitude and loudness decrease. (D)</p> Signup and view all the answers

<p>Solid (D)</p> Signup and view all the answers

<p>Pressure of the medium (C)</p> Signup and view all the answers

<p>newton (A)</p> Signup and view all the answers

<p>F = ma (C)</p> Signup and view all the answers

<p>Its mass and velocity (B)</p> Signup and view all the answers

<p>Increase the time of contact (B)</p> Signup and view all the answers

<p>Body B applies an equal and opposite force FB on A. (B)</p> Signup and view all the answers

<p>A balloon deflates and moves in the opposite direction. (B)</p> Signup and view all the answers

<p>It decreases the rate of change of momentum. (B)</p> Signup and view all the answers

<p>It has both direction and magnitude. (B)</p> Signup and view all the answers

<p>A rocket launching into space. (A)</p> Signup and view all the answers

<p>Aluminium (C)</p> Signup and view all the answers

<p>1498 m/s (C)</p> Signup and view all the answers

<p>Sonic boom (C)</p> Signup and view all the answers

<p>The angle of incidence is equal to the angle of reflection. (C)</p> Signup and view all the answers

<p>Sulphur dioxide (A)</p> Signup and view all the answers

<p>They can shatter window glass and damage buildings. (A)</p> Signup and view all the answers

<p>346 m/s (D)</p> Signup and view all the answers

<p>Gaseous mediums (C)</p> Signup and view all the answers

<p>They always travel slower than sound. (A)</p> Signup and view all the answers

<p>Sound reflects better off larger surfaces. (C)</p> Signup and view all the answers

The fundamental units of measurement in the International System of Units (SI).

Metre (m).

Kilogram (kg).

Second (s).

Units created by combining base units. Ex. Speed = distance/time.

Square metre (m²).

Cubic metre (m³).

Change in momentum of an object is proportional to the applied unbalanced force in the same direction.

Kilogram-meter per second squared (kg m/s²), also known as a Newton (N).

Force (F) equals mass (m) multiplied by acceleration (a), or F=ma.

Momentum (p) is the product of mass (m) and velocity (v), or p=mv.

Momentum has the same direction as velocity.

Increasing the time taken to change velocity reduces the force exerted.

For every action, there's an equal and opposite reaction on different objects.

Forces act in equal but opposite directions on different objects.

A real-world example of action-reaction; gun pushes bullet forward, bullet pushes gun backward.

A system that uses sound waves to detect objects underwater, like submarines or fish.

A transmitter sends out ultrasonic waves. These waves bounce off objects underwater and are then picked up by a detector. The time it takes for the sound to travel to the object and back is used to calculate the distance.

A thin membrane in the ear that vibrates when sound waves hit it.

A spiral-shaped organ in the inner ear that converts vibrations into electrical signals that the brain can understand.

Unwanted or excessive sound that can harm human health.

The extent of vibration of particles in a sound wave; larger amplitude means louder sound.

The amount of sound energy passing through a unit area each second.

The distance a sound wave travels per unit of time in a medium.

Speed of sound varies based on the medium. Solids > Liquids > Gases.

Loudness of sound is directly proportional to the square of the amplitude of the sound wave.

Sound speed increases with increasing temperature in a medium.

Sound travels faster in humid air than dry air because humidity reduces air density.

Sound speed is not affected by pressure changes in a medium.

Sound travels much slower than light.

Sound travels significantly faster in water than in air.

The speed at which sound waves travel through a medium, measured in meters per second (m/s).

The loud sound produced when an object travels faster than the speed of sound, creating shock waves.

The speed at which an object travels faster than the speed of sound.

The bouncing back of sound waves when they strike a surface.

The sound wave that strikes a surface.

The sound wave that bounces back from a surface.

Rules that govern how sound waves reflect off surfaces. The angle of incidence is equal to the angle of reflection, and all angles are in the same plane.

A surface or object that causes sound waves to reflect.

The substance through which sound waves travel, such as air, water, or solids.

The speed of sound varies depending on the medium it travels through. Sound travels faster in denser mediums like solids and slower in less dense mediums like gases.