NEB Question Browser

A saturated hydrocarbon has its molecular mass 30 amu. Write the IUPAC name of the compound formed by replacing its two -H atoms one from each carbon atoms by one of each of -OH groups. Also, write one use of the compound.

Write any one food preservative that is found easily and cheap, and can be used as a fruit ripening agent for mango and banana. Mention an adverse effect of excessive use of it in human health.

Write the principle which explains why a ship floats on water.

Which of the following is a fungicide?

i. Cypermethrin

ii. Carbendazim

iii. Butachlor

iv. Zinc Phosphide

i. Which is the correct order of metal processing for their purification?

i. Concentration, Oxidation, Refining, Reduction

ii. Concentration, Reduction, Oxidation, Refining

iii. Concentration, Reduction, Refining, Oxidation

iv. Concentration, Oxidation, Reduction, Refining

Which of the following shows the correct order of the atomic radii of the elements nitrogen, oxygen and fluorine?

i. O < F < N

ii. N < F < O

iii. O < N < F

iv. F < O < N

If a transformer has more turns in the secondary winding than in the primary winding, which of the following statements is correct?

i. It does not change A.C. voltage.

ii. It decreases A.C. voltage.

iii. It increases A.C. voltage.

iv. It increases A.C. voltage according to the situation.

What is called the effect of heat on the volume of an object?

i. Thermal expansion

ii. Thermal conduction

iii. Thermal equilibrium

iv. Thermal radiation

How much force is produced in piston Q in the given figure?

i. 80 N

ii. 100 N

iii. 400 N

iv. 500 N

If the weight of an object on the surface of the Moon is 66 N, what might be the weight of the object on the Earth? (Acceleration due to gravity of the Moon is 1.63 m/s²)

i. 396 N

ii. 66 N

iii. 11 N

iv. 6.6 N

How does the plantation of trees help reduce the effects of climate change?

i. By increasing oxygen level in the atmosphere

ii. By reducing the amount of carbon dioxide through photosynthesis

iii. By lowering the temperature of the environment

iv. By making a lot of rainfall

Look at the given figure and answer the following questions.

Which of the following statements is true about baseband transmission?

i. Digital signals are converted to analog signals and sent to the channel.

ii. Separate channels are used for sending and receiving signals.

iii. Sending and receiving signals are done in the same channel simultaneously.

iv. Generally, it is used for long distance communication.

Write any one difference between rare and endangered species.

a. Write any two differences between direct current and alternating current.

b. Write any two ways of increasing electricity from a dynamo.

When someone left a pickle jar unsealed, causing it to spoil in a short period. Utilize food preservation principles to clarify the cause of this spoilage and state the necessary preventive measures.

Study the structure of the given organic compound.

Write one medicinal use of the organism shown in the figure.

Write any two negative impacts of digital technology in our society. How do you use ICT to be a good digital citizen? Mention any two points.

Study the following electronic configuration of elements X and Y.