SEE Science & Technology Question Paper 2080
Multiple Choice Questions
1) Circle the correct alternative of the following questions.
What is the modulator in the digital communication system used for?
Arpit Sundas
·
1 year ago
Solution
Option C is the correction option.
Changing digital signal into analogue signal to provide direction to pass into medium is what modulator is used in the digital communication system. It modifies digital signal in terms of frequency and amplitude for easy transmission of data through the channel.
Other options are not correct.
Sarita found a plant in her surroundings and claimed that the plant was a dicot. If her conclusion is right, which of the following statements is true?
Two black guinea pigs mated and the off-springs born were 3 black and 1 white guinea pigs. What is the genotypic ratio?
What is the medical term for blockage of blood carrying oxygen to cardiac muscles?
A feather and a coin released from the same height at the same time do not reach the ground at the same time. What is the cause of it?
Under what condition with the object weight 16.7 N on the moon?
A student is given a convex lens of focal length 25 cm. He places a burning candle at a distance of 40 cm away from the lens. At what distance will he obtain a sharp image of the candle?
Which of the following is the source of AC?
To which period does an element having an electronic configuration of 1s2, 2s2, 2p6, 3s2, 3p4 belong to?
DDT along with other 21 chemicals was banned in Nepal in 2001. What do you think was the cause?
Section B
Very short answer type questions.
What type of signal is a human heart beat?
Arpit Sundas
·
1 year ago
Solution
The heartbeat signal can be considered an analog signal because it varies continuously over time. The amplitude and frequency of the electrical signals correspond to the heart's activity and can change based on factors like exercise, stress, or health conditions.
What relation exists between specific heat capacity and change in temperature?
How is it possible for doctors to examine internal body parts seeing the image of the inside of the body clearly?
Arpit Sundas
·
1 year ago
Solution
Doctors can examine internal body parts clearly using fiber optic scopes. These scopes contain bundles of flexible optical fibers. Each fiber carries a tiny part of the image, and when combined, they form a clear picture of the internal area being examined. Here’s how it works:
- Light Transmission: Some fibers in the scope carry light into the body, illuminating the area of interest.
- Image Transmission: Other fibers pick up the light reflected from the internal tissues. Each fiber in the bundle transmits a small part of the image, which collectively forms a detailed picture.
These fibers use total internal reflection to keep the light signals inside each fiber, even when the scope bends. This way, doctors get a clear, real-time view of internal organs and tissues without large incisions, allowing for effective diagnosis and treatment.
Arpit Sundas
·
1 year ago
Solution
The chief ore of copper is Chalcopyrite (\(\rm CuFeS_{2}\)).
It contains about 34.5% copper.
Name the alcohol used in spirit lamps.
Arpit Sundas
·
1 year ago
Solution
The alcohol used in spirit lamps is Methyl alcohol (CH3OH)
Section C
Check the correctness of the physical equation: $\rm s = ut + \frac{1}{2} at^{2}$.
The cockroach has three pairs of joined legs. Which phylum will you classify it to? Write one additional feature of the organisms belonging to that phylum.
Classification of organisms reflects evolutionary trends. Present two strong reasons to support this statement.
Arpit Sundas
·
1 year ago
Solution
The act of grouping organisms according to their similarities and differences is termed as classification.
Classification groups organisms based on similar traits, which often come from a common ancestor. For example, mammals are classified together because they share traits like warm bloodedness and milk production, showing an evolutionary link to a shared ancestor.
As organisms evolve, they develop new traits suited to their environment. Classification reflects these adaptations by grouping organisms that have evolved similarly, helping us observe evolutionary patterns like the transition from aquatic to land animals. This highlights evolutionary progress and adaptation across groups.
Hence, classification of organisms reflects evolutionary trends.