Physics - Comprehensive Mock Test 1

Question 1 Medium

ध्वनि की तीव्रता (Intensity of Sound) मापने की इकाई क्या है?

A) हर्ट्ज़ (Hertz) B) डेसिबल (Decibel) C) पास्कल (Pascal) D) वाट (Watt)

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Solution Breakdown:

ध्वनि की तीव्रता को मापने के लिए डेसिबल (dB) इकाई का उपयोग किया जाता है। हर्ट्ज़ (Hz) ध्वनि की आवृत्ति (Frequency) मापने की इकाई है।

Question 2 Medium

An object is shot vertically upward. While it is rising

A) its velocity and acceleration are both upward B) its velocity is upward and its acceleration is downward C) its velocity and acceleration are both downward D) its velocity is downward and its acceleration is upward

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Solution Breakdown:

No Details

Question 3 Easy

3.2 × 2.7 =

A) 9 B) 8 C) 8.6 D) 8.64

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Solution Breakdown:

No Details

Question 4 Easy

The number of significant figures in 15.0 is

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

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Solution Breakdown:

No Details

Question 5 Easy

The number of significant figures in 0.00150 is

A) 2 B) 3 C) 4 D) 5

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Solution Breakdown:

No Details

Question 6 Easy

A gram is

A) 10⁻⁶ B) 10⁶ C) 10⁻³ D) 10³

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Solution Breakdown:

No Details

Question 7 Medium

In sunlight, a rose appears red In green light, the same rose appears

A) red B) black C) green D) yellow

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Solution Breakdown:

Any object which allows light to pass through it is known as a transparent object. The colour of any transparent object is the colour of the light transmitted by it. A red rose appears red in white light because it absorbs all colours except red. However, when seen in green light, it looks black because the red colour of the rose is absorbed by the green light. 

Question 8 Medium

The hydraulic brakes used in automobiles is a direct application of

A) Archimedes' principle B) Toricellian law C) Bernoulli's theorem D) Pascal's law

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Solution Breakdown:

Pascal's principle guarantees that the pressure is transmitted equally to all parts of the enclosed fluid system. This gives straightline braking unless there is a fluid leak or something to cause a significant difference in the friction of the surfaces. The hydraulic brake is an arrangement of braking mechanism which uses brake fluid, typically containing ethylene glycol, to transfer pressure from the controlling unit, which is usually near the operator of the vehicle, to the actual brake mechanism, which is usually at or near the wheel of the vehicle.

Question 9 Medium

In a refrigerator, the cooling system should always be

A) at the top B) at the bottom C) at the middle D) can be anywhere

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Solution Breakdown:

The compressor is the motor (or engine) of the cooling system. It is normally at the bottom of the refrigerator in the back. The compressor runs whenever the refrigerator thermostat calls for cooling.

Question 10 Medium

Which physical quantity is measured in ‘siemens’

A) Electric potential B) Electrical conductance C) Magnetic flux D) Refractive index

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Solution Breakdown:

The Siemens is the unit of electric conductance, electric susceptance and electric admittance in the International System of Units (SI).