MCQ
Part-I Secondary and Senior Secondary Standard: MCQ - Practice Questions with Answers
Solve 350 Part-I Secondary and Senior Secondary Standard: questions for RAS/RPSC preparation.
Practice questions
Q1For the exothermic equilibrium 2SO2(g) + O2(g) reversible 2SO3(g), which combination favours the maximum equilibrium yield of SO3?
Le Chatelier's principle predicts that lowering temperature favours the exothermic direction, here formation of SO3. Increasing pressure favours the side with fewer gas molecules; the forward side has 2 mol gas compared with 3 mol gas on the reactant side. Therefore low temperature and high pressure give the greater equilibrium yield, apart from kinetic-rate considerations.
Q2A compound has empirical formula CH2O and molar mass 180 g mol^-1. What is its molecular formula?
The empirical formula gives the simplest whole-number atom ratio. For CH2O, the empirical formula mass is 12 + 2 + 16 = 30 g mol^-1. The multiplier is molecular mass divided by empirical formula mass, 180/30 = 6. Multiplying all subscripts by 6 gives the molecular formula C6H12O6.
Q3Down syndrome is most commonly associated with trisomy of which human chromosome?
Down syndrome is a chromosomal disorder caused most often by the presence of an additional chromosome 21. That is why it is also called trisomy 21 in standard genetics teaching.
Q4Which option correctly matches an algal class with its reserve food and characteristic pigment?
Among algae, hard matching questions often mix pigment and reserve food across classes. Rhodophyceae are red algae because phycoerythrin predominates, and their reserve food is floridean starch. Brown algae instead have fucoxanthin and store laminarin or mannitol, while green algae store starch.
Q5The blue colour of the clear sky is mainly due to
Fine particles and molecules in the atmosphere scatter shorter wavelengths of visible light more effectively than longer wavelengths. Since blue light has a shorter wavelength than red light, scattered blue light reaches our eyes from different directions, giving the clear sky its blue colour.
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6Which pair correctly matches a natural gene-delivery system with its engineered use in recombinant DNA technology?
7For the vector P = 6 i-hat - 8 j-hat, which of the following is the unit vector in the direction of P?
8In an astronomical telescope used for viewing distant stars, why is the objective lens usually made with a large aperture?
9For typhoid diagnosis and transmission, which statement is the best answer for a senior-secondary biology standard question?
10In an electrochemical cell based on a spontaneous redox reaction, which statement correctly describes the anode?
11A teacher is explaining the classical Ayurvedic idea of tridosha. Which set should be selected?
12A vernier caliper has 1 main scale division = 1 mm and 10 vernier divisions equal 9 main scale divisions. If a reading is 2.4 cm on the main scale and the 7th vernier division coincides, what is the measured length before applying any zero correction?
13A farmer stores unripe bananas in a chamber with ripened oranges and later observes faster banana ripening. Which regulator and property explain this observation most precisely?
14A wheel rolls without slipping on a horizontal road. If the speed of its centre of mass is v and its radius is R, which relation must hold?
15Which option correctly distinguishes active immunisation from passive immunisation in an emergency-prone example?