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Test: Physics - 1


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20 Questions MCQ Test Science & Technology for UPSC CSE | Test: Physics - 1

Test: Physics - 1 for UPSC 2023 is part of Science & Technology for UPSC CSE preparation. The Test: Physics - 1 questions and answers have been prepared according to the UPSC exam syllabus.The Test: Physics - 1 MCQs are made for UPSC 2023 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Physics - 1 below.
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Test: Physics - 1 - Question 1

An iron needle sinks in water whereas a ship made of iron floats on it because

Detailed Solution for Test: Physics - 1 - Question 1

Because the specific gravity of the needle is greater than that of water displaced by it. Specific gravity (or relative density) = Density of the substance / Density of the water at 4°C The average density of iron needle is greater than water, therefore, it sinks.

Test: Physics - 1 - Question 2

The cloudy nights are warmer than clear nights because

Detailed Solution for Test: Physics - 1 - Question 2

The cloudy nights are warmer because clouds prevent escape of radiation of heat from the ground and the air.

Test: Physics - 1 - Question 3

Food gets cooked faster in a pressure cooker because

Detailed Solution for Test: Physics - 1 - Question 3

At that pressure, water boils at 121°C (250°F). That means food can cook at a much higher temperature than it ever could at atmospheric pressure—and since cooking reactions speed up at higher temperatures, your food cooks faster.

Test: Physics - 1 - Question 4

It is more comfortable to wear white cloths in summer because

Detailed Solution for Test: Physics - 1 - Question 4

The white clothes reflect heat falling on them in summer and they absorb the least from the sun.

Test: Physics - 1 - Question 5

Of the two bulbs in a house, one glows brighter than the other. Which of the following statements is correct?

Detailed Solution for Test: Physics - 1 - Question 5

The dimmer bulb has larger resistance than the brighter one. Power of the bulb ∝ 1 / Resistance Resistance is the obstruction offer to the flow of current.

Test: Physics - 1 - Question 6

A fluorescent tube is preferred to an electric bulb because

Detailed Solution for Test: Physics - 1 - Question 6

In a fluorescent tube, electrical energy is almost converted into light. The inner wall of the fluorescent tube is coated with phosphorus which immediately transformed into bright light.

Test: Physics - 1 - Question 7

Consider the following statements in respect of a jet engine and a rocket:
1. A jet engine uses the surrounding air for its oxygen supply and so is unsuitable for motion in space.
2. A rocket carries its own supply of oxygen in the gas form as a fuel.

Q. Which of the above statement(s) is/are correct?

Detailed Solution for Test: Physics - 1 - Question 7

In respect of a jet engine and a rocket, both the given statements are correct.

Test: Physics - 1 - Question 8

The leaning tower of Pisa does not fall because

Detailed Solution for Test: Physics - 1 - Question 8

Because the vertical line through the centre of gravity of the tower falls within the base.

Test: Physics - 1 - Question 9

 Electronic motors operating at low voltages tend to burn out because

Detailed Solution for Test: Physics - 1 - Question 9

Electronic motors draw more current which is inversely proportional to the voltage, therefore, more heat H = I2Rt is generated.

Test: Physics - 1 - Question 10

If the doors of a refrigerator are left open for a few hours, the room temperature will

Detailed Solution for Test: Physics - 1 - Question 10

If the doors of a refrigerator are left open for a few hours, the room temperature will increases. It is because system releases heat to the surroundings.

Test: Physics - 1 - Question 11

If a rock is brought from the surface of the moon to the earth, then

Detailed Solution for Test: Physics - 1 - Question 11

If a rock is brought from the surface of the moon to the earth, its weight will change but not its mass. Mass is a invariant physical quantity whereas weight of a body (w = mg) is variable as the value of acceleration due to gravity (g) changes.

Test: Physics - 1 - Question 12

Match List-I with List-II and select the correct answer using the codes given below the lists:

Detailed Solution for Test: Physics - 1 - Question 12

Wavelength is the distance between two consecutive crests or troughs and 1 angstrom = 10–10m, joule is the unit of energy. Intensity of sound is measured in decibel. Frequency is measured in hertz (Hz).

Test: Physics - 1 - Question 13

Match List-I with List-II and select the correct answer with the help of codes given below:

 

Detailed Solution for Test: Physics - 1 - Question 13

The unit of temperature is kelvin, power is measured in watt, pressure in pascal and force in newton.

Test: Physics - 1 - Question 14

Which one of the following statements is not true about cosmic rays?

Detailed Solution for Test: Physics - 1 - Question 14

Cosmic rays have very high frequency >1023 Hz and wavelength <10–24 m.

Test: Physics - 1 - Question 15

Pendulum clocks become slow in summer because

Detailed Solution for Test: Physics - 1 - Question 15

Pendulum clocks become slow in summer because the length of the pendulum increases. Increase in length ∆l = lo α ∆T where lo = original length, α = coefficient of linear expansion and ∆T = change in temperature.

Test: Physics - 1 - Question 16

Consider the following statements and select the correct code:
Assertion (A): A piece of ice added to the drink cools it.
Reason (R): Ice takes latent heat from the drink for melting resulting in the cooling of the drink.

Detailed Solution for Test: Physics - 1 - Question 16

A piece of ice added to the drink cool it because ice takes latent heat from the drink for melting resulting in the cooling of the drink.

Test: Physics - 1 - Question 17

Match List-I with List-II and select the correct answer using the codes given below the lists:

Detailed Solution for Test: Physics - 1 - Question 17

Revolver was discovered by Colt. Dynamite was discovered by Alfred Nobel. Law of cooling was discovered by Newton and law of pressure by Pascal.

Test: Physics - 1 - Question 18

The atmosphere exerts enormous pressure on us. But, we don’t feel it because

Detailed Solution for Test: Physics - 1 - Question 18

We don’t feel the atmospheric pressure because our blood exerts a pressure slightly more than that of the atmosphere.

Test: Physics - 1 - Question 19

Which one of the following statements is not true for a person suffering from hypermetropia?

Detailed Solution for Test: Physics - 1 - Question 19

Hypermetropia is corrected by using a convex lens.

Myopia is corrected by concave lens.

Test: Physics - 1 - Question 20

Consider the following statements and select the correct answer using the codes given below:
Assertion (A): If ice collects on the freezer, the cooling in the refrigerator is affected adversely.
Reason (R): Ice is a poor conductor.

Detailed Solution for Test: Physics - 1 - Question 20

If ice collects on the freezer, the cooling in the refrigerator is affected adversely because ice is a poor conductor of heat.

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