class 10 science board exam important questions || topper series by pk sir ||science mcq & one liner

class 10 science board exam important questions || topper series by pk sir ||science mcq & one liner
‪@P.k.Study_Centre‬
‪@vikassirbseb‬
‪@pkstudycentre1‬
This video is the first part of a "Topper Series" live class by PK Sir, aimed at 10th-grade science students preparing for the Bihar Board exams in 2026 (2:46). The goal of this series is to help students achieve high scores, potentially 90+ marks, in their science exam (7:28). The class covers important objective (MCQ) and one-liner questions, with the one-liner questions also serving as practice for longer 2-mark and 5-mark answer writing (3:19, 8:02-8:40).

Key topics discussed in this session include:
Physics of Light (10:05-18:20, 32:53-38:20):
The focus distance of a plane mirror is infinite (10:05).
Laws of light reflection involve the incident ray, reflected ray, and normal lying in the same plane, and the angle of incidence equaling the angle of reflection (10:48).
Real images are formed in front of the mirror (12:58).
The speed of light is lowest in glass due to its highest density (32:53).
Mirror magnification is the ratio of the height of the image to the height of the object (35:12).
The transparent front part of the human eye is the cornea (36:05).
Bifocal lenses are used to correct presbyopia (37:40).
Electricity (13:37-16:52, 33:47-34:10, 41:19-42:16, 43:10-44:50, 46:06-46:40):
Ohm's Law relates electric current, potential difference, and resistance (13:37).
The practical unit of electrical energy is kilowatt-hour (33:47).
An electric fuse works on the heating effect of current and protects appliances from excessive current (41:19, 44:21).
Devices like coils do not have positive and negative signs (43:10).
The heating element of an electric heater is made of Nichrome (46:06).
Biology (34:15-35:01, 38:26-39:25, 42:27-43:09, 45:29-46:03, 47:58-48:26):
The human eye forms images on the retina (called drishti patal in Hindi) (34:15).
The human heart has four chambers (38:26).
Rod cells in the eye are sensitive to dim light (38:55).
Water transport in plants occurs through xylem (42:27).
Food transport in plants occurs through phloem (42:47).
In respiration, organisms take in oxygen and release carbon dioxide (45:29).
The full form of DNA is Deoxyribonucleic Acid (47:58).
Chemistry (37:09-37:37, 39:34-40:02, 40:46-41:16):
Soap is an alkaline salt (37:09).
The lightest metal is lithium (39:34).
Rusting is an example of oxidation (40:46).
General Concepts (47:06-47:55):
Solar energy is renewable (47:06).
The ability to do work is called energy (47:42).
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