The correct answer is (a) Lentil. Lentils are pulses, not cereals. Cereal crops like millets, sorghum, and maize belong to the grass family (Poaceae) and are grown mainly for their edible grains, rich in carbohydrates. Class 9th Science NCERT MCQ ...
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The correct answer is (a) Lentil. Lentil is a pulse, not a cereal crop. Cereals like millets, sorghum, and maize are grass-family crops primarily grown for their edible seeds, which are rich in carbohydrates. Class 9th Science NCERT MCQ Questions
The correct answer is (c) Gram. Gram (such as chickpeas) is a rich source of protein, essential for body growth and repair. Millets, sorghum, and rice primarily provide carbohydrates, though they contain small amounts of protein. Class 9th Science NCERT ...
The correct answer is (d) All of the above. To solve the food problem, increased production and proper storage of food grains are essential. Additionally, people must have purchasing power and easy access to food to ensure food security for ...
The correct answer is (b) 1.4 m. The wavelength (λ) is calculated using the formula: λ = v/f where v = 350 m/s (velocity of sound) and f = 250 Hz (frequency). λ = 350/250 = 1.4m. Class 9th Science ...
The correct answer is (c) Frequency. When a sound wave moves from air to water, its speed and wavelength change due to the difference in medium density. However, frequency remains unchanged because it depends only on the source of the ...
The correct answer is (c) 200 Hz. The frequency (f) is given by the formula: F = 1/T where T = 0.005 s. F = 1/0.005 = 200 Hz. Class 9th Science NCERT MCQ Questions NCERT Books MCQ Questions Session ...
The correct answer is (b) 1815 m. The distance is calculated using distance = speed × time. Given the speed of sound as 330 m/s and time as 5.5 s, the distance is 330 × 5.5 = 1815 m. Class ...
The correct answer is (a) sound will be louder but pitch will not be different. Loudness depends on the amplitude of vibration, which increases when the key is struck harder. However, pitch depends on frequency, which remains unchanged as it ...
The correct answer is (b) quality. Even if the same notes are played on a guitar and a harmonium, they sound different due to their quality (timbre). Quality depends on the instrument’s harmonic overtones, which create a unique sound. Class ...