Q. Which one of the following is not an example of a redox reaction?
1) AlCl3+3H2O → Al(OH)3+ 3HCl
2) 2NaH → 2NA + H2
3) 4Fe + 3O2 → 2Fe2O3
4) CuSO4 + Zn → Cu + ZnSO4
Q. For an element with atomic number 35, which one of the following will be the correct number of electrons in its valence shell based on Bohr's model of an atom?
1) 1
2) 3
3) 5
4) 7
Q. A sound wave has a frequency of 1 kHz and a wavelength of 50 cm. How long will it take to travel 1 km?
1) 5 s
2) 4 s
3) 3 s
4) 2 s
Q. The energy possessed by a body due to its change in position or shape is called -
1) thermal energy
2) potential energy
3) kinetic energy
4) electric energy
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
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