General Q&A for Class 12 · Page 226
5,215 free answers in General for Class 12 students, across CBSE, ICSE and State boards.
Question & Answer
Questions
- GeneralClass 12All
Which batsman has 0 ducks?
No batsman who has played a significant number of international matches has zero ducks (dismissals for zero runs). Even the greatest batsmen like Sachin Tendulkar, Virat Kohli, and Ricky Ponting have been dismissed for ducks multiple times throughout their careers. Having zero ducks would require an exceptionally short career or extraordinary consistency.
- GeneralClass 12All
Who hit 158 meter six?
Shahid Afridi is often credited with hitting one of the longest sixes in cricket history, measuring approximately 158 meters during a match. However, measurement accuracy varies, and several modern players including Albie Morkel and Brett Lee have also been credited with sixes exceeding 150 meters. These measurements can vary depending on the tracking technology used.
- GeneralClass 12All
Who hit 7 sixes in 1 over?
Hitting 7 sixes in one over is impossible in standard cricket, as an over consists of only 6 legal deliveries. However, if no-balls or wides are bowled, an over can extend beyond 6 balls. In such extended overs, batsmen have occasionally hit 7 or more sixes, though this is extremely rare and typically occurs in T20 franchise leagues.
- GeneralClass 12All
Who hit 6 fours in 6 balls?
While hitting six consecutive boundaries is relatively rare, it's more common than six sixes. Several batsmen have achieved this feat in various formats. The most notable instances often occur in limited-overs cricket where batsmen target weaker bowlers or exploit field restrictions during powerplay overs.
- GeneralClass 12All
Who made 100 runs in 22 balls?
No player has scored a century in just 22 balls in international cricket. The fastest T20I century was scored by Rohit Sharma in 35 balls. In ODI cricket, AB de Villiers holds the record with a 31-ball century. A 22-ball hundred would be exceptionally rare even in domestic cricket, though some T20 leagues have witnessed ultra-fast centuries.
- GeneralClass 12All
Who hit 50 runs in 12 balls?
Yuvraj Singh scored the fastest 50 in T20 International cricket, reaching the milestone in just 12 balls during the 2007 T20 World Cup against England. This innings included his famous six sixes in an over against Stuart Broad. The record showcases his aggressive batting style and remains one of the quickest half-centuries in the shortest format of the game.
- GeneralClass 12All
Who scored 77 runs in one over?
No player has scored 77 runs in a single over in international cricket. The maximum runs scored in an over in competitive cricket is 36 runs (six sixes), achieved by players like Yuvraj Singh. There may be confusion with domestic or exhibition matches, but 77 runs in one over would be extraordinarily rare and not part of standard cricket records.
- GeneralClass 12All
Who beat 6 balls 6 sixes?
Yuvraj Singh achieved this remarkable feat during the 2007 T20 World Cup against England, hitting Stuart Broad for six consecutive sixes in one over. This performance remains one of the most celebrated moments in cricket, demonstrating extraordinary power-hitting and timing. Other cricketers like Herschelle Gibbs, Ross Whiteley, and Kieron Pollard have also accomplished this in various formats and tournaments.
- GeneralClass 12All
Who scored 36 runs in 1 over?
Yuvraj Singh holds the record for scoring 36 runs in a single over during the 2007 ICC World T20 match against England. He hit Stuart Broad for six consecutive sixes in an over, creating one of the most iconic moments in cricket history. This feat occurred during India's group stage match in Durban, South Africa, and showcased Yuvraj's explosive batting capabilities at the peak of his powers.
- GeneralClass 12All
(a) What is meant by 'reproductive health'? (b) State the conditions necessary to maintain good reproductive health during adolescence.
(a) Reproductive health, as defined by the World Health Organization, is a state of complete physical, mental, and social well-being in all matters relating to the reproductive system and its functions and processes—not merely the absence of disease or infirmity. This comprehensive definition recognizes that reproductive health encompasses much more than just the ability to reproduce; it includes having a satisfying and safe sex life, the capability to reproduce with the freedom to deci
- GeneralClass 12All
(a) What is an exocrine gland? Name two exocrine glands. (b) What is an endocrine gland? Name two endocrine glands?
(a) Exocrine glands are glands that secrete their products through ducts (tubes) directly to specific target locations rather than into the bloodstream. These secretions are released onto body surfaces (like skin) or into body cavities (like the digestive tract) where they perform specific local functions. The term "exocrine" comes from Greek words meaning "to secrete outward." These glands produce a wide variety of substances including enzymes, mucus, sweat, saliva, and milk, each serving di
- GeneralClass 12All
Describe menstrual cycle. What is the duration of menstrual cycle in women?
The menstrual cycle is the regular, recurring series of physiological changes that occur in the female reproductive system, preparing the body for potential pregnancy each month. This cycle is orchestrated by a complex interplay of hormones produced by the hypothalamus, pituitary gland, and ovaries. The cycle involves two main coordinated processes: the ovarian cycle (changes in the ovaries) and the uterine cycle (changes in the uterine lining), both controlled by fluctuating hormone levels.
- GeneralClass 12All
Name sex endocrine glands in the human body. Also name the hormones secreted by each one of the these glands.
The sex endocrine glands, also called gonads, are the organs specifically responsible for producing sex hormones and reproductive cells. In males, the sex endocrine glands are the testes (singular: testis), a pair of oval-shaped organs located in the scrotum outside the body cavity. In females, the sex endocrine glands are the ovaries, a pair of almond-shaped organs located in the pelvic cavity on either side of the uterus. These glands have dual functions: producing gametes (sex cells) and s
- GeneralClass 12All
Explain why, people are advised to use iodised salt in cooking food.
People are advised to use iodized salt in cooking because iodine is an essential micronutrient that the human body cannot produce on its own and must obtain through diet. Iodine is a critical component of thyroid hormones—thyroxine (T4) and triiodothyronine (T3)—which the thyroid gland produces to regulate metabolism, growth, development, and numerous bodily functions. Without adequate iodine intake, the thyroid cannot synthesize these hormones properly, leading to a cascade of he
- GeneralClass 12All
Explain why, the use of drugs helps in spreading AIDS disease.
The use of drugs, particularly injectable drugs, significantly facilitates the spread of AIDS by creating direct pathways for HIV transmission through contaminated needles and syringes. When multiple people share injection equipment—needles, syringes, or other paraphernalia used to prepare and inject drugs—they directly exchange blood, which is one of the most efficient routes of HIV transmission. Even tiny amounts of blood invisible to the naked eye can remain in a needle or syri
- GeneralClass 12All
What name is given to the onset of menstruation in human females (or girls)? At what age does this occur?
The onset of menstruation in human females is called menarche, which marks the first menstrual period and signals that a girl has reached reproductive maturity. Menarche represents a significant milestone in pubertal development, indicating that the hormonal systems regulating the reproductive cycle have matured sufficiently to support ovulation and potential pregnancy, though early menstrual cycles are often irregular and may not involve ovulation (anovulatory cycles) for the first year or t
- GeneralClass 12All
(a) Name two male sex organs and two female sex organs which develop completely at puberty. (b) Name two things which may develop on the face of adolescent boys and girls during puberty due to the increased activity of sebaceous glands and sweat glands in the skin.
(a) In males, the two primary sex organs that develop completely at puberty are the testes and the penis. During childhood, these organs remain relatively small and immature. At puberty, rising testosterone levels cause significant growth and functional maturation. The testes enlarge substantially and begin producing viable sperm through spermatogenesis, while also increasing testosterone production. The penis increases in both length and girth, becoming capable of erection and ejaculation. I
- GeneralClass 12All
What do you know about AIDS?
AIDS (Acquired Immuno Deficiency Syndrome) is a life-threatening condition caused by the Human Immunodeficiency Virus (HIV), which attacks and destroys the body's immune system, specifically targeting CD4+ T-cells (white blood cells crucial for fighting infections). When HIV infection progresses to AIDS, the immune system becomes so severely damaged that the body cannot defend itself against opportunistic infections and certain cancers that would normally be controlled by a healthy immune sys
- GeneralClass 12All
Write a brief note on changes at puberty.
Puberty is the developmental period when children transition into sexually mature adults capable of reproduction, typically occurring between ages 10-14 for girls and 12-16 for boys, though timing varies considerably. This transformation is orchestrated by hormones released from the hypothalamus and pituitary gland, which stimulate the gonads (ovaries or testes) to produce sex hormones—estrogen and progesterone in girls, testosterone in boys. These hormonal surges trigger a cascade of p
- GeneralClass 12All
What are the effects of increased activity of sweat and sebaceous glands?
During adolescence, increased activity of sweat and sebaceous glands is triggered by rising hormone levels, particularly androgens. The most noticeable effect of increased sweat gland activity is greater perspiration, especially in the underarm, groin, hands, and feet areas. This can lead to stronger body odor because sweat interacts with bacteria on the skin, producing characteristic smells. Adolescents often become more conscious of hygiene during this period and may need to bathe more freq