Tag: science & technology

Samudragupta (reigned 335-380 CE) of the Gupta Empire is indeed called the 'Napoleon of India' by historian Vincent Smith due to his extensive military conquests and territorial expansion across the Indian subcontinent.

Balaram, brother of Krishna, is traditionally depicted carrying a hala (plough) and a gada (mace). The plough represents his agricultural role, while the mace shows his warrior strength. Hanuman carries a mace, Bhima carries a mace, and Angad is not associated with these weapons.

Mansur Ali Khan Pataudi (also known as Tiger Pataudi) was NOT India's first ODI captain. India's first ODI captain was Ajit Wadekar, who led the team in their inaugural ODI against England in 1974. Pataudi was a famous Test captain but had retired from captaincy before ODIs began.

Diamond and graphite are both crystalline forms of carbon, making them allotropes - different structural arrangements of the same element. Diamond has a tetrahedral structure making it extremely hard, while graphite has layered hexagonal sheets making it soft. Nylon is a synthetic polymer (not an element), and silica is a silicon-oxygen compound (SiO2), neither of which are carbon allotropes.

Electromagnetic waves are transverse waves that don't require a medium and travel at the speed of light. Infrared, ultraviolet, and X-rays are all parts of the electromagnetic spectrum. Sound waves are mechanical longitudinal waves that require a material medium (solid, liquid, or gas) to propagate and cannot travel through vacuum, making them fundamentally different from electromagnetic waves.

Newton's first law (law of inertia) states that objects resist changes in motion - a resting object stays at rest, and a moving object continues with constant velocity unless acted upon by an unbalanced external force. Options A, B, and C correctly describe this principle. Option D is false because a body CAN move at constant speed with an external force if the force is perpendicular to motion (like circular motion), or if balanced forces act on it.

Decimal 135 equals 87 in hex (8×16+7), 207 in octal (2×64+0×8+7), and 10000111 in binary (128+4+2+1). Option D (1000111=7 bits) is incorrect - the binary representation requires 8 bits (10000111). Verify: hex 87 (8×16+7=135), octal 207 (2×64+0×8+7=135).

All four are valid angle units. Radian and degree are the most common, with 2π radians = 360 degrees. Minute (1/60 degree) and second (1/60 minute = 1/3600 degree) are subdivisions used for precise measurements in navigation and astronomy.

Vitamin K is essential for blood clotting as it helps produce clotting factors in the liver. Vitamins B1 (thiamine), B2 (riboflavin), and D are unrelated to coagulation - B vitamins aid metabolism, D regulates calcium.

ECG (electrocardiogram) records the heart's electrical activity and is used to diagnose heart conditions like arrhythmias, heart attacks, and conduction defects. It is not used for brain (EEG), kidneys, or lungs.