Test : Physics - 2


Test Description

20 Questions MCQ Test NDA (National Defence Academy) Mock Test Series | Test : Physics - 2

Test : Physics - 2 for Defence 2022 is part of NDA (National Defence Academy) Mock Test Series preparation. The Test : Physics - 2 questions and answers have been prepared according to the Defence exam syllabus.The Test : Physics - 2 MCQs are made for Defence 2022 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test : Physics - 2 below.
Solutions of Test : Physics - 2 questions in English are available as part of our NDA (National Defence Academy) Mock Test Series for Defence & Test : Physics - 2 solutions in Hindi for NDA (National Defence Academy) Mock Test Series course. Download more important topics, notes, lectures and mock test series for Defence Exam by signing up for free. Attempt Test : Physics - 2 | 20 questions in 25 minutes | Mock test for Defence preparation | Free important questions MCQ to study NDA (National Defence Academy) Mock Test Series for Defence Exam | Download free PDF with solutions
1 Crore+ students have signed up on EduRev. Have you?
Test : Physics - 2 - Question 1

A black body is at temperature o 500 K. it emits energy rate which is proportional to

Detailed Solution for Test : Physics - 2 - Question 1

According to Stefan's law, energy emitted

Test : Physics - 2 - Question 2

The speed of a car moving on a straight road becomes 50 km/hr  from 20 km/hr  in 10 seconds. The acceleration of the car is—

Detailed Solution for Test : Physics - 2 - Question 2

acceleration

Test : Physics - 2 - Question 3

If the number of rotations of earth increases, then the weight of the objects on its surface—

Detailed Solution for Test : Physics - 2 - Question 3

The centripetal force required for the circular motion is obtained by the weight of the object. Similarly, the centripetal acceleration required for the circular motion is obtained by the gravitational acceleration, when the object exhibiting circular motion is situated on earth’s surface. In this way the effective gravitational acceleration (g’) of the particle in circular motion will be—

g'=g-rγω2  cos⁡λ

Where, r is the radius of the circular path, ω is the angular velocity. From the above relation it is clear that g’ will decrease with increase in ω. Therefore, the weight of an object will decrease.

Test : Physics - 2 - Question 4

Red is used an as emergency or danger signal as

Detailed Solution for Test : Physics - 2 - Question 4

Red is used as an emergency or danger signal as its wavelength is the longest of the entirecolor and is able to travel the longest distance through fog, rain etc.

Test : Physics - 2 - Question 5

The speed of light with the rise in the temperature of the medium

Detailed Solution for Test : Physics - 2 - Question 5

The speed of light with the rise in the temperature of the median remains unaltered as the speed of light is independent of the temperature of the medium.

Test : Physics - 2 - Question 6

Five resistances of 10 ohm each are connected as shown in fig.

The equivalent resistance between A and C will be—

Detailed Solution for Test : Physics - 2 - Question 6

In a balanced Wheatstone bridge the points B and D are at the same potential. When battery is connected between A and C no current flows through BD. Therefore, the 10 ohm resistance of BD is ineffective. Therefore, resistance of ABC

= 10+10

= 20 ohm

Resistance of ADC = 10+10

=20ohm

Both are joined in parallel therefore, if their equivalent resistance is R. then

Test : Physics - 2 - Question 7

Tungsten is used for the manufacture of the filament of an electric bulb, because

Detailed Solution for Test : Physics - 2 - Question 7

Tungsten has a very high melting point (3422ᵒC).

Test : Physics - 2 - Question 8

The material used in the fabrication of a transistor is

Detailed Solution for Test : Physics - 2 - Question 8

A transistor is a semiconductor device used to amplify and switch electronic signals and electrical power. Silicon is a semiconductor material which is mostly used in the fabrication of the transistor.

Test : Physics - 2 - Question 9

Sound travels in the form of 

Detailed Solution for Test : Physics - 2 - Question 9

Sound travels in the form of longitudinal waves. These waves travel in the form of compressions and rarefactions.

Test : Physics - 2 - Question 10

The speed of light will be minimum while passing through- 

Detailed Solution for Test : Physics - 2 - Question 10

Any of the object or material which has the highest refractive index has the minimum speed of light. The glass has the highest refractive index among other like, vacuum, water and air. 

Test : Physics - 2 - Question 11

The radius of curvature of the plane mirror is: 

Detailed Solution for Test : Physics - 2 - Question 11

The radius of curvature of the plane is infinity. 

Test : Physics - 2 - Question 12

Which one of the following is the best conductor of electricity? 

Detailed Solution for Test : Physics - 2 - Question 12

Electrical conductivity is a measure of the amount of electrical current under a material can carry. The most electrically conductive element is silver. 

Test : Physics - 2 - Question 13

Which is not used as Atomic fuel? 

Detailed Solution for Test : Physics - 2 - Question 13

The most common nuclear fuels are uranium – 235 (235U) and plutonium -239(239Pu). Thorium is more abundant in nature than uranium. Thorium can be used as a nuclear fuel through breeding to uranium-233 (U-233). Lead is not used as a nuclear fuel. 

Test : Physics - 2 - Question 14

The gas used in discharge tubes for optical decoration and advertising is- 

Detailed Solution for Test : Physics - 2 - Question 14

The neon gas is used in discharge lamps, tubes and in fluorescent bulbs.

Test : Physics - 2 - Question 15

Which one of the following pairs is not correctly matched: 

Detailed Solution for Test : Physics - 2 - Question 15

In 1935 Meson particles were discovered by Japanese physicist Hideki Yukawa. Positron, the antiparticle of the antimatter counterpart of the electron was discovered by C.D. Anderson and U.F. Hess in 1932. In 1939, Hans Bethe described the nuclear reactions that power the sun and other starts. In the synthesis of transuranic elements, Glenn T. Scaborg played an important role instead of Enrico Fermi. The fact is that he attempted to prepare a transuranium element in 1934 in Rome but failed to do so. 

Test : Physics - 2 - Question 16

The maximum density of water is at 

Detailed Solution for Test : Physics - 2 - Question 16

The density of water increases with temperature but volume decreases. At 4°C, the volume of water is low and density is maximum. Conversion of Celsius in Kelvin 

K = C + 273 

= 4 + 273 = 277 

So, the density of water is maximum at 277 K. 

Test : Physics - 2 - Question 17

 The technique to integrate and mark the image of a three- the Dimensional object is- 

Detailed Solution for Test : Physics - 2 - Question 17

Holography is a technique of producing a three-dimensional image of an object.

Test : Physics - 2 - Question 18

Which type of electromagnetic radiation is used in the remote control of a television receiver? 

Detailed Solution for Test : Physics - 2 - Question 18

Most remote controls of a television receiver send signals using Infra-red radiation.

Test : Physics - 2 - Question 19

 Which one of the following is not correct:  

Detailed Solution for Test : Physics - 2 - Question 19

Option (b) is not correct. It is because the breaking apart of nucleus of an atom is called fission not fusion. Fission is a radioactive decay process in which the nucleus of an atom splits into smaller parts.

Test : Physics - 2 - Question 20

The quality of sound produced by an instrument depends on the 

Use Code STAYHOME200 and get INR 200 additional OFF
Use Coupon Code
Information about Test : Physics - 2 Page
In this test you can find the Exam questions for Test : Physics - 2 solved & explained in the simplest way possible. Besides giving Questions and answers for Test : Physics - 2, EduRev gives you an ample number of Online tests for practice