Comprehensive collection of questions from General Science asked in recent state service examinations. Each question is verified with official answer keys and step-by-step bilingual solutions.
Two persons on the surface of the Moon cannot hear each other talk because:
At a temperature of about $20^\circ\text{C}$, the speed of sound will be maximum in which medium?
For music concerts, the walls of the hall should:
The velocity of sound in air is approximately:
Ultrasonic waves are those sound waves whose frequency is:
What is the audible frequency range for human beings?
Consider the following statements: 1. The heart vibrates at infrasonic frequencies. 2. The speed of sound is more in gas than in liquid and solid. 3. Mach number is used to describe the speed of sound. 4. Ultrasonic sound has a frequency of more than 20,000 Hz. Of these statements:
Sound waves travel fastest in:
To hear a distinct echo, the minimum distance between the reflecting surface and the listener should be:
Assertion (A): The speed of an aircraft flying at Mach 1 at an altitude of 15 km is greater than that of an aircraft flying at Mach 1 near sea level. Reason (R): The speed of sound depends on the temperature of the surrounding medium. Code:
An astronaut cannot hear his companion at the surface of the Moon because:
Consider the following statements: 1. A flute of smaller length produces waves of lower frequency. 2. Sound travels through rocks only in the form of longitudinal elastic waves. Which of the statements given above is/are correct?
Arrange the speed of sound in ascending order in the following media: I. Water, II. Steel, III. Nitrogen
The velocity of sound will be maximum in -
A biological method in which ultrasonic sound is used is:
Sound waves-
Sound waves in air are:
In which of the following options can sound not pass through?
When a sound wave goes from one medium to another, the quantity that remains unchanged is:
What should be the minimum distance between the sound source and reflecting surface so that an echo is clearly heard?
Consider the following statements regarding ultrasonic waves: 1. They can destroy insects. 2. They can clean clothes by removing dust. 3. They can be used to treat diseases. 4. They can control automatic doors. Which of the statements given above are correct?
Supersonic jet flights cause damage to:
If $V_a$, $V_w$, and $V_s$ are the speeds of sound in air, water, and steel respectively, then:
Sound waves cannot travel in:
Bats can fly in the dark and hunt their prey because: