General Science Physics MCQ-5

The velocity of flow of liquid through an orifice at the bottom of a tank depends on the

(A) height of the liquid above the orifice
(B) acceleration due to gravity
(C) area of the cross-section of the orifice
(D) Both (a) and (b)

Consider the following statements
1. Light of longer wavelength is scattered much more than the light of shorter wavelength.
2. The speed of visible light in water is 95 times the speed in vacuum.
3. Radio waves are produced by rapidly oscillating electrical currents.
4. To detect the over speeding vehicles, police use the Doppler effect of reflected short radio waves.
Which of these statements are correct?

(A) 1 and 2
(B) 1 and 3
(C) 2 and 4
(D) 3 and 4

Why do two ice blocks join to form one block when pressed together?

(A) Melting point of ice is lowered with increase in pressure
(B) Melting point of ice increases with increase in pressure
(C) Melting point of ice remains unchanged with increase in pressure
(D) Melting point of ice is 00C

Consider the following statements
1. The viscosity of a gas increases with rise in temperature.
2. The viscosity of the liquid falls very rapidly with rise in temperature.
Which of the statements (s) given above is/are correct?

(A) Only 1
(B) Only 2
(C) Both 1 and 2
(D) Neither 1 nor 2

The audible frequency range of a human ear is

(A) 20 Hz to 200 Hz
(B) 2 Hz to 20 Hz
(C) 200 Hz to 2000 Hz
(D) 20 Hz to 2000 Hz

Assertion (A) When water flows in a uniform horizontal pipe, there is a fall in pressure of water along the pipe.
Reason (R) Force is required to maintain the motion of the liquid against friction
code.

(A) Both A and R are individually true and R is the correct explanation of A
(B) Both A and R are individually true but R is not the correct explanation of A
(C) A is true but R is false
(D) A is false but R is true

Consider the following statements
1. The coefficient of viscosity is the only parameter through which the viscosity of the fluid is measured.
2. Negative sign of coefficient of viscosity indicates that the viscous force opposes the relative motion.
3. The SI unit of viscosity is N- s – m- -2
4. 1 poise = 1 N – sm-2.
Which of the statements given above are correct?

(A) 1, 2 and 3
(B) 3, 4 and 2
(C) 2, 3 and 4
(D) 1,2, 3 and 4

Ultrasonic waves are those waves which

(A) human beings can hear
(B) human beings cannot hear
(C) have high velocity
(D) have large amplitude

Consider the following statements
1. SI unit of atmospheric pressure is Pascal and CGS unit is dyne/cm
2. The barometer is a device by which the atmospheric pressure is measured.
3.The standard atmospheric pressure is the pressure required of 76 cm of Hg column or 760 mm of Hg column, which is equivalent to 1 a t m.
Which of the statements given above is/are correct?

(A) 1 and 2
(B) Only 1
(C) 2 and 3
(D) 1, 2 and 3

A large tank having a small hole at the bottom is filled with water to a height h.If the stream of water coming out of the hole is directed vertically upwards it will

(A) rise to a height less than h
(B) rise to height h
(C) rise to height greater than h
(D) Not rise at all

With the rise of temperature, the speed of sound in a gas

(A) decreases
(B) increases
(C) remains the same
(D) None of the above

A floating body always displaces liquid equal to its own

(A) mass
(B) weight
(C) volume
(D) None of these

Consider the following statements
1. Venturimeter is an instrument and is based upon Bernoulli’s theorem by which the rate of flow of the liquid is measured through a pipe.
2. Pilot tube is an instrument and is based upon Bernoulli’s theorem by which the rate of flow of the gas is measured.
Which of the statement(s) given above is/are correct?

(A) Only 1
(B) Only 2
(C) Both 1 and 2
(D) Neither 1 nor 2

Transverse waves can propagate

(A) in a gas but not in a metal
(B) both in a gas and in a metal
(C) not in a gas but in a metal
(D) neither in a gas nor in a metal

A block of ice is floating in a glass containing water. When the ice melts completely, the level of the water in the glass will

(A) rise
(B) fall .
(C) not change
(D) None of the above

The Young’s modulus for perfectly rigid body is

(A) zero
(B) 1
(C) infinite
(D) None of these

Which one of the following is the correct sequence of wavelengths of radiations?

(A) UV > Green > IR > Hard X-rays
(B) IR > Green > UV > Hard X-rays
(C) UV > Hard X-rays > IR > Green
(D) IR > Hard X-rays > Green > UV