Q: An electric bulb has a filament made of

A: Boron carbide

B: Tungsten

C: Tantalum

D: Rhenium



Correct Option: B  [ Tungsten ]

Remark:

Explanation: The filament of an electric bulb is made of tungsten because it has a very high melting point of about 3380°C and good tensile strength. When electric current passes through it, tungsten glows brightly without melting, converting electrical energy into light and heat. It also has low vapour pressure, which prevents quick evaporation of the filament even at high temperatures, ensuring longer bulb life.


Q: Any part of the computer, which can be seen by the eyes and felt by touching, is called:

A: Hardware

B: Software

C: Liveware

D: Firmware



Correct Option: A  [ Hardware ]

Remark:

Explanation: Hardware refers to the physical components of a computer that can be seen and touched, such as the monitor, keyboard, mouse, CPU, and printer. In contrast, software consists of programs and instructions that control the hardware and perform tasks.


Q: Electric appliances have star rating ( upto 5 stars) on them. More the number of stars :

1. longer is the life span of the appliance
2. more stringent is the quality checks
3. Higher is the energy efficiency of the appliance

Which of the above is / are correct ?

A: 1 only

B: 3 only

C: 1 and 2 only

D: 1, 2 and 3



Correct Option: B  [ 3 only ]

Remark:

Explanation: The star rating system seen on electrical appliances (like ACs, refrigerators, and fans) represents the energy efficiency of the product. It is issued by the Bureau of Energy Efficiency (BEE), under the Ministry of Power, Government of India. The more the number of stars (up to 5), the higher the energy efficiency — meaning the appliance consumes less electricity for the same performance. However, the star rating does not indicate the lifespan or the quality checks of the appliance.


Q: The process by which energy is generated in the Sun is :

A: Nuclear fusion

B: Nuclear fission

C: Both nuclear fusion and nuclear fission

D: The burning of gases



Correct Option: A  [ Nuclear fusion ]

Remark:

Explanation: The Sun produces its enormous energy through the process of nuclear fusion. In this process, hydrogen nuclei (protons) combine under extremely high temperature and pressure to form helium, releasing a tremendous amount of energy in the form of light and heat. The main fusion reaction in the Sun is the proton–proton chain. Unlike fission (splitting of nuclei), fusion combines light nuclei, and this is what powers all stars, including the Sun.


Q: The layer of the atmosphere in which Radio Waves are reflected back is called:

A: Exosphere

B: Ionosphere

C: Troposphere

D: Stratosphere



Correct Option: B  [ Ionosphere ]

Remark:


Q: What does the term Dolby B or Dolby C printed on tape recorders and other sound systems refer to?

A: frequency modulated system

B: amplitude modulated system

C: noise reduction circuit

D: both DC and AC power can be used



Correct Option: C  [ noise reduction circuit ]

Remark:

Explanation: The terms Dolby B and Dolby C refer to noise reduction circuits used in tape recorders and sound systems. These technologies reduce background hiss and unwanted noise during playback and recording, thereby improving the overall sound quality.


Q: A network of computers and other peripherals that is confined to a relatively small space is call:

A: Local Area Network

B: Wide Area Network

C: Global Network

D: Intranet



Correct Option: A  [ Local Area Network ]

Remark:

Explanation: A Local Area Network (LAN) is a network of computers and peripherals confined to a small geographical area, such as a home, school, or office building. It enables resource sharing, file transfer, and communication among connected devices within the limited range.


Q: Heavy water is :

A: Ice

B: Water at 4 degree Celsius

C: Deuterium oxide

D: Solution of sugar and water



Correct Option: C  [ Deuterium oxide ]

Remark:

Explanation: Heavy water is chemically known as Deuterium oxide (D₂O). It is similar to ordinary water (H₂O), but the hydrogen atoms are replaced by deuterium — a heavier isotope of hydrogen containing one proton and one neutron. Heavy water is not suitable for drinking but is used as a moderator and coolant in nuclear reactors because it slows down neutrons, allowing a controlled nuclear fission reaction. It is also used in scientific research and isotope studies.


Q: The animal group that is not found in marine water:

A: Mammals

B: Amphibia

C: Reptiles

D: Aves



Correct Option: D  [ Aves ]

Remark:

Explanation: Marine environments support various groups of animals including mammals (whales, seals), reptiles (sea turtles, sea snakes), and numerous invertebrates. However, birds (Aves) are air-breathing terrestrial vertebrates. While certain birds like penguins, pelicans, and seagulls feed or swim in the ocean, they do not permanently live in marine water or breathe underwater — thus, they are not considere


Q: The sex of a newborn baby is determined by the chromosome inherited from :

A: the mother

B: mother's mother

C: the father

D: father's father



Correct Option: C  [ the father ]

Remark:

Explanation: The sex of a newborn baby is determined by the chromosome inherited from the father. Humans have 23 pairs of chromosomes — 22 pairs of autosomes and one pair of sex chromosomes. Females have two X chromosomes (XX), while males have one X and one Y chromosome (XY). The mother always contributes an X chromosome, but the father can contribute either an X or a Y. If the sperm carrying an X chromosome fertilizes the ovum, the child will be a girl (XX); if the sperm carries a Y chromosome, the child will be a boy (XY).
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