25-03-2021 Science and Tech Important Questions

1) Question

Consider the following statements:

1) Nano particles can be used to purify drinking water.

2) Nano composite plastic films can be used to preserve food for a long time.

3) Titanium oxide Nano coating can provide long time colouring to cars.

Which of the statements given above is/are correct?

1 and 3

2 and 3

1,2 and 3

1 only

2) Question

Which of the following crops are used for producing Bio fuels –

1) Sugar cane
2) Corn
3) Potato
Choose the correct option

1 and 2 only

1 and 3 only

2 and 3 only

1, 2 and 3 only

3) Question

Why does the Government of India promote the use of Neem-coated Urea’ in agriculture?

release of neem oil in the soil increses nitrogen fixation by the soil microorganisms

neem coating slows down the the rate dissolution of urea in the soil

nitrous oxide which is a green house gas is not at all released into atmosphere by crop fields

it is combination of a weedicide and a fertilizer for particular crops

4) Question

Find correct statement –

flash memory is volatile memory

RAM is an example of non volatile memory

both A and B

Neither A nor B

5) Question

Consider the following statements regarding DHANUSH –

1) It is indigenous Advanced Towed Artillery Gun System (ATAGS)
2) Dhanush 155 MM/52 calibre towed artillery gun is based on the 1980s’ Bofors FH-77B/39 Calibre artillery gun design. Its indigenous development is aided by the transfer of technology (ToT) clause signed with the Swedish company.
3) It boasts a range of 20 km with accuracy and precision and provides greater fire power, depending on the type of ammunition used.
Correct options are –

1 and 2

2 and 3

1 and 3

all are correct