Physics Test

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Physics Test - 56

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Weekly Quiz Competition

Question 1
1 / -0

A person is sitting in a moving train and is facing the engine. He tosses up a coin and the cion fals behind him. It can be concluded that the train is moving:

A
forward and loosing speed

B
forward and gaining speed

C
forward and uniform speed

D
backward with uniform speed

Solution

A person is sitting in a moving train and is facing the engine. He tosses up a coin and the cion fals behind him. It can be concluded that the train is movingforward and gaining speed.
Question 2
1 / -0

When a steel ball is placed on the surface of mercury, it does not sink because

A
of the surface tension of mercury

B
mercury is a semisolid

C
of the high viscosity of mercury

D
the density of mercury is greater than that of steel

Solution

A solid sinks in a liquid if its density is greater than that of the liquid. if less, it floats.
Question 3
1 / -0

When a ray of light is refracted by a prism such that the angle of deviation is minimum then

A
the angle of emergence is equal to the angle of incidence

B
the angle of emergence is greater than the angle of incidence

C
the angle of emergence is smaller than the angle of incidence

D
the sum of the angle of incidence and the angle of emergence is equal to 90 degrees

Solution

When a ray of light is refracted by a prism such that the angle of deviation is minimum then the angle of emergence is equal to the angle of incidence.
Question 4
1 / -0

Which of the following definitions describes a physical hazard?

A
The most commonly thought of hazard in construction. This hazard includes radiation, extreme temperatures, noise, and vibration.

B
These hazards can lead to injuries to the joints or muscles by way of heavy, frequent lifting, repetitive tasks.

C
Can be present in dust, fumes, liquids, solids, mists, vapors, or gases of products used at a site or released during a construction job

D
Microorganisms, such as bacteria, fungus, mold, or viruses that can cause illness.

Solution

A physical hazard is defined as "A factor within the environment that can harm the body without necessarily touching it."

Vibration and noise are examples of physical hazards.

Physical hazards include but aren't limited to electricity, radiation, pressure, noise, heights and vibration amongst many others.
Question 5
1 / -0

When light enters from air to water, then its

A
frequency increases and speed decreases

B
frequency is same but the wavelength is smaller in water than in air

C
frequency is same but the wavelength is larger in water than in air

D
frequency and speed both decreases

Solution

When light enters from air to water, then itsfrequency is same but the wavelength is smaller in water than in air.
Question 6
1 / -0

Which of the following is a scalar quantity

A
electric current

B
electric field

C
Acceleration

D
linear momentum

Solution

A Scalar quantity is a quantity that has only magnitude but no direction as like vector.

Here in the given options, electric current is the only one which is scalar.
Question 7
1 / -0

A cyclist leans inwards when he is negotiating a curve so that

A
he may increase his speed

B
his weight may be reduced

C
necessary centripetal force may be available from the horizontal component of the normal reaction due to the track to maintain the curved motion.

D
no frictional force may be produced between the wheels and the axle

Solution

No circular or curved motion is possible without providing the necessary centripetal force. (C) provides this and so is the answer.
Question 8
1 / -0

A standing wave occurs when

A
a wave reflects upon itself

B
the amplitude of a wave exceeds its wavelength

C
two waves overlap

D
the speed of the wave is zero or near zero

Solution

A standing wave also known as a stationary wave, is a wave in which its peaks or any other point on the wave do not move spatially.

This phenomenon can occur because the medium is moving in the opposite direction to the wave, or it can arise in a stationary medium as a result of interference between two waves traveling in opposite directions. The most common cause of standing waves is the phenomenon of resonance, in which standing waves occur inside a resonator due to interference between waves reflected back and forth at the resonator's resonant frequency.

Hence, standing wave occurs when a wave reflects upon itself.
Question 9
1 / -0

Number of basic SI unit is

A
4

B
7

C
6

D
5

Solution

Number of basic SI unit is 7.
Question 10
1 / -0

Quality of transmission depends upon

A
Nature of signal only

B
Nature of medium only

C
Both (A) and (B)

D
Neither A nor B

Solution

Quality of transmission is governed both by nature of signal and nature of communication channel/medium.

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Re-Attempt Weekly Quiz Competition

Physics Test - 56

Result

Physics Test - 56

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SHARING IS CARING

Question 1

forward and loosing speed

forward and gaining speed

forward and uniform speed

backward with uniform speed

Solution

Question 2

of the surface tension of mercury

mercury is a semisolid

of the high viscosity of mercury

the density of mercury is greater than that of steel

Solution

Question 3

the angle of emergence is equal to the angle of incidence

the angle of emergence is greater than the angle of incidence

the angle of emergence is smaller than the angle of incidence

the sum of the angle of incidence and the angle of emergence is equal to 90 degrees

Solution

Question 4

The most commonly thought of hazard in construction. This hazard includes radiation, extreme temperatures, noise, and vibration.

These hazards can lead to injuries to the joints or muscles by way of heavy, frequent lifting, repetitive tasks.

Can be present in dust, fumes, liquids, solids, mists, vapors, or gases of products used at a site or released during a construction job

Microorganisms, such as bacteria, fungus, mold, or viruses that can cause illness.

Solution

Question 5

frequency increases and speed decreases

frequency is same but the wavelength is smaller in water than in air

frequency is same but the wavelength is larger in water than in air

frequency and speed both decreases

Solution

Question 6

electric current

electric field

Acceleration

linear momentum

Solution

Question 7

he may increase his speed

his weight may be reduced

necessary centripetal force may be available from the horizontal component of the normal reaction due to the track to maintain the curved motion.

no frictional force may be produced between the wheels and the axle

Solution

Question 8

a wave reflects upon itself

the amplitude of a wave exceeds its wavelength

two waves overlap

the speed of the wave is zero or near zero

Solution

Question 9

4

7

6

5

Solution

Question 10

Nature of signal only

Nature of medium only

Both (A) and (B)

Neither A nor B

Solution

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