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# PhysicalGeneral Knowledge Teaching Exams State Level Railways SSC Computer Skill English Speaking/Wr

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Question1) 1.Consider the following regarding the differences between ‘holography’ and ‘photography’:

When a photograph is cut in half, each piece shows half of the scene. When a hologram is cut in half, the whole scene can still be seen in each piece.

A lens is required in photography to record the image, whereas in holography, the light from the object is scattered directly onto the recording medium.

Select the statement(s) which is/are correct?

[A] Only 1

[B] Only 2

[C] Both 1 and 2

[D] Neither 1 nor 2

Option- ['A', 'B', 'C', 'D']

Explaination: photograph can be recorded using lens and normal light sources but in case of holography, laser is required and the light from the object is scattered directly onto the recording medium. After cutting of a photograph, each piece shows half of the scene but in holography, each piece shows the whole scene.

Question2) 2.Which of the following cases amount to be some work done in terms of Physics?

A man pushing a wall but failing to move it

A coolie standing with a load of 12 kg on his head

A boy climbing up a staircase

A boy carrying a box on his head and sliding over a frictionless horizontal surface

Select the correct option from the codes given below:

[A] Only 2 & 3

[B] Only 3 & 4

[C] Only 1, 3 & 4

[D] Only 3

Option- ['A', 'B', 'C', 'D']

Explaination: case (iii) work is done, because displacement is produced in the direction of applied force. In cases (i), (ii) and (iv), no work is done as no displacement occurs in the direction of applied force.

Question3) 3.Which of the following is / are advantages of the Solar Energy in comparison to the traditional energy sources?

Solar electrical power generation has the highest power density among all the renewable energy sources

Solar energy is clean, sustainable and doesn’t let out carbon dioxide

Solar electricity is presently cheaper than the electricity given by other sources

Select the correct option from the codes given below:

[A] Only 1 is correct

[B] Only 1 & 2 are correct

[C] Only 2 & 3 are correct

[D] 1, 2 & 3 are correct

Option- ['A', 'B', 'C', 'D']

Explaination: The initial cost is very high. Means the installing costs can get costly, usually due to the high-cost semiconductor materials, which are used to build a solar energy system. Solar electricity is presently costlier than the electricity given by other sources. Naturally as energy shortages are becoming common day-by-day, solar energy is thus becoming more price-competitive. Kindly, also note that a Considerable amount of energy is lost when DC (direct current) has to be converted to AC (alternating current). The solar cells can only produce DC, thus the conversion by help of Grid-Tie Inverters incurs a loss of about 4-12%.

[A] It is an ionizing radiation

[B] It is unable to penetrate human skin

[C] It is toxic to human tissues

[D] It is not cost effective

Option- ['A', 'B', 'C', 'D']

Explaination: B [ It is unable to penetrate human skin]

Notes:

The alpha particles have very large atomic volume and hence do not penetrate human skin.

Question5) 5.Consider the following types of images:

1. Real, inverted and highly diminished image

2. 2. Real, inverted and enlarged image

3. 3. Virtual, erect and enlarged image

4. 4. Virtual erect and diminished image

5. Which among the above is / are formed by convex lens?

[A] Only 1, 2 & 3

[B] Only 1, 2 & 4

[C] Only 2, 3 & 4

[D] 1, 2, 3 & 4

Option- ['A', 'B', 'C', 'D']