Test Details

Class 12th Physics Test

Dec 08, 7:00 PM

30 minutes

Dec 08, 7:30 PM

80.0 marks

MCQ

38 questions

Mayur Sir

Mayur Raj has completed B. Tech from Electrical Engineering and Now Pursuing BA- LLB . He is teaching from 2013 Now He has transformed teaching section for students or parents that deserve education.

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Class 12th

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Question Text

Question 1 :
The image of our face in a plane mirror is :

Question 2 :
Assertion: We can hear around corners, but we cannot see around corners. Reason: Wavelength of sound in much greater than wavelength of light.

Question 3 :
Which of the following statements is correct regarding the propagation of light of different colors of white light in air?<br/>

Question 4 :
Mark True if the statement is true and False if it is false:<br>We can obtain a real, enlarged and inverted image by a concave mirror.<br>

Question 5 :
If $x_1$ be the size of the magnified image and $x_2$ the size of the diminished image in Lens Displacement Method, then the size of the object is

Question 6 :
A perfectly reflecting mirror has an area of $1\ cm^{2}$. Light energy is allowed to fall on it for $1\ h$ at the rate of $10W/ cm^{2}$. The force that acts on the mirror is:

Question 7 :
A narrow of white light goes through a slab having parallel faces.

Question 8 :
Image formed by a plane mirror is<br/>a) of same size as that of object<br/>b) at the same distance behind the mirror as the object in front<br/>c) erect, virtual<br/>Mark the correct statements:<br/>

Question 9 :
Which type of an image is formed by a plane mirror?

Question 10 :
State whether given statement is True or FalseThe process of convection can takes place only in liquid and gases.

Question 14 :
Assertion: Air is a good conductor of heat Reason: It's molecules are in close contact with each other

Question 15 :
When a mercury thermometer is inserted in a pot of hot water and the reading is recorded , what temperature is being

Question 17 :
At what temperature is the Fahrenheit scale reading equal to twice of Celsius ?

Question 18 :
The steam point and the ice point of a mercury thermometer are marked $80^0$ and $20^0.$  what will be the temperature in centigrade mercury scale when this thermometer reads $32^0$

Question 19 :
Mercury is often used in clinical thermometers. Which one of the following properties of mercury is not a reason for this ?

Question 20 :
Assertion: Though air is a bad conductor yet a body kept in air loses heat quickly.<br/> Reason: The heat loss is mainly due to radiation.

Question 21 :
a corked bottle full of water when frozen will break because.

Question 22 :
There are two hollow spheres made of different materials, one with double the radius and one fourth wall thickness of the other are filled with ice. If the time taken for melting the ice completely in larger sphere is $25$ minutes and that for smaller sphere is $16$ minutes, the ratio of the thermal conductivity of the larger sphere to the smaller sphere is :

Question 23 :
Complete the following sentences :A fuse is connected in .......... with the .......... wire.

Question 24 :
State whether true or false :<br>An electromagnet requires a continuous supply of current to maintain the magnetic field.

Question 26 :
Shivam went for buying a CFL from D-mart, what safety mark he should look for?

Question 27 :
The circuit breaker device which can be used in place of a fuse is called<br/>

Question 29 :
Which of these devices uses a magnet or electromagnet to make it work?

Question 30 :
Assertion: On a vibrating bell, the bell will ring continuously until the power is cut off. Reason: These have to be mechanically controlled

Question 31 :
In electric fuse, some special wire is used, which is having _______ melting point

Question 35 :
You are given two fuse wires A and B with current rating2.5 A and 6 A respectively. Which of the two wires wouldyou select for use with a 1100 W, 220 V room heater?

Question 36 :
Why the applications of permanent magnet in the field ofengineering are quite limited?

Question 37 :
Match the following<table class="wysiwyg-table"><tbody><tr><td>1. Horse-shoe magnet</td><td>a. Holds the armature in place</td></tr><tr><td>2. Armature</td><td>b. Electromagnet</td></tr><tr><td>3. Spring strip</td><td>c. Passes electric current to the spring strip</td></tr><tr><td>4. Adjusting screw</td><td>d. Fixed to the spring strip</td></tr></tbody></table>

Question 38 :
A fuse wire with a radius of $0.1 mm$ blows up at $5 A$. The radius of another fuse wire made of the same material which will blow up at $40 A$ is _____.

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