विज्ञान – Science MCQ
विज्ञान – डिप्लोमा प्रवेश
Science · CTEVT Diploma Engineering Entrance · ४११ प्रश्न
४११ प्रश्न उपलब्ध। मोड छान्नुहोस्:
विज्ञान: प्रश्न र उत्तर
सही लागेको विकल्पमा थिच्नुहोस्। सही भए हरियो, गलत भए रातो देखिन्छ; ३ सेकेन्डपछि सही उत्तर र व्याख्या देखिन्छ।
सही: ० / ०
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The momentum of a 2 kg ball moving at 5 m/s is:
सही उत्तर: ग) 10 kg m/s
Momentum p = mv = 2 × 5 = 10 kg m/s.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The tendency of a body to remain at rest or in uniform motion unless acted on by an external force is called:
सही उत्तर: क) inertia
Newton's first law describes inertia, the property of a body to resist any change in its state of rest or motion.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A green potted plant is kept in darkness for 48 hours before a starch test is done. The purpose is to:
सही उत्तर: क) Remove the stored starch from the leaves
Keeping a plant in darkness destarches the leaves, so any starch found later must come from photosynthesis during the experiment. Chlorophyll is not increased by darkness.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A patient's pancreas does not produce enough insulin. The disease likely to develop is:
सही उत्तर: ग) Diabetes mellitus
Insulin lowers blood glucose; its deficiency raises blood sugar, causing diabetes mellitus. Goitre is linked to iodine deficiency and the thyroid.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A cell with 46 chromosomes divides by mitosis. Each daughter cell will have:
सही उत्तर: ख) 46 chromosomes
Mitosis produces two daughter cells identical to the parent, each with 46 chromosomes. Halving to 23 happens only in meiosis.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A human body cell has 46 chromosomes. The number of chromosomes in a human sperm cell is:
सही उत्तर: घ) 23
Gametes form by meiosis, which halves the chromosome number, giving 23. Fertilisation restores the number to 46.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In a food chain, producers trap 10000 J of energy. According to the 10% law, the energy available to tertiary consumers is:
सही उत्तर: क) 10 J
Energy passes 10% at each step: producers 10000 → primary 1000 → secondary 100 → tertiary 10 J. 100 J is what secondary consumers receive.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In humans, the probability that a newborn baby will be a boy is:
सही उत्तर: ख) 50%
The mother gives X; the father gives X or Y with equal chance, so XY (boy) has a probability of 1/2. The sex of the child is therefore decided by the father's sperm.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In Mendel's dihybrid cross, the phenotypic ratio in the F₂ generation is:
सही उत्तर: ग) 9 : 3 : 3 : 1
Crossing two dihybrids (e.g., RrYy × RrYy) gives four phenotypes in 9 : 3 : 3 : 1. 1 : 1 : 1 : 1 is the ratio of a dihybrid test cross.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A heterozygous tall pea plant (Tt) is crossed with a dwarf plant (tt). The percentage of dwarf offspring expected is:
सही उत्तर: ग) 50%
Tt × tt gives Tt and tt in equal numbers, so 50% are dwarf. This is a test cross; 25% dwarf is from Tt × Tt.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
यी अभ्यास प्रश्न हुन्, आधिकारिक प्रश्न होइनन्। पाठ्यक्रम, विज्ञापन र नतिजाका लागि सम्बन्धित निकायको आधिकारिक वेबसाइट हेर्नुहोस्। उत्तरमा गल्ती भेटे प्रश्नमुनिको "टिप्पणी / गल्ती रिपोर्ट" मा लेख्नुहोस्।
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