Q. A boy of mass 52 kg jumps with a horizontal velocity of 2 m/s onto a stationary cart of mass 3 kg. The cart is fixed with frictionless wheels. Which one of the following would be the speed of the cart?
1) 2.15 m/s
2) 1.89 m/s
3) 1.51 m/s
4) 2.51 m/s
Q. A 5N force is defined when a mass of 10 kg is accelerated with -
1) 5.0cm/s2
2) 0.5 m/s2
3) 0.5 cm/s2
4) 5.0 m/s2
Q. A mass M is dragged by a pulley on a horizontal plane by a force anti-parallel to its displacement. The work done in pulling the mass M is -
1) zero
2) positive
3) infinite
4) negative
Q. The twinkling of a star is due to the atmospheric -
1) diffraction of starlight
2) reflection of starlight
3) refraction of starlight
4) dispersion of starlight
Q. Which one of the following is caused by a bacterial pathogen?
1) AIDS
2) Dengue fever
3) COVID-19
4) Typhoid fever
Q. Which one of the following groups are called amphibians of plant kingdom?
1) Bryophytes
2) Thallophytes
3) Pteridophytes
4) Gymnosperms
Q. Which one of the following belongs to Pisces?
1) Dogfish
2) Jellyfish
3) Silverfish
4) Starfish
Q. In aquatic plants, large air sacs give them buoyancy effects. These sacs are surrounded by which one of the following types of tissues?
1) Parenchyma
2) Collenchyma
3) Sclerenchyma
4) Complex tissue
Q. Which one of the following statements about 'vacuoles' is not correct?
1) In plants, there is a large central vacuole that may occupy 90% of total cell volume
2) In plant cells, vacuoles provide turgidity and rigidity
3) In Amoeba, vacuoles have a role in nutrition
4) Vacuoles are absent in animal cells
Q. Which one of the following plant plastids stores starch, oil, and protein granules?
1) Chloroplast
2) Leucoplast
3) Chromoplast
4) Xanthoplast
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