UKSSSC Forest SI (Forester) Exam Paper 11 June 2023 (Answer Key)

21. Two resistors of resistance 2 Ω and 4 Ω when connected to a battery will have
(A) Same current flowing through them when connected in parallel
(B) Same current flowing through them when connected in series
(C) Same potential difference across them when connected in series
(D) Different potential difference across them when connected in parallel

22. The power of a crane, which lifts a mass of 50 kg to a height of 20 m in 20 second will be (Given, gm/s²)
(A) 490 W
(B) 980 W
(C) 1000 W
(D) 500 W

23. Colour of scattered light depends on the size of scattering particle of medium. On the basis of this which of the following pair is mismatched?
(A) Blue light – very fine particles
(B) Red light – fine particle
(C) Yellow light – large size particle
(D) White light – water droplet present in cloud

24. 10 J work done is equal to
(A) 1 Nm
(B) 10 Nm
(C) 103 Nm
(D) 100 Nm

25. During the formation of primary rainbow, a light ray undergoes following sequential incidents from reaching to water droplet to our eyes
(A) Refraction, internal reflection, refraction
(B) Internal reflection, refraction
(C) Refraction, internal reflection
(D) Internal reflection, refraction, internal reflection

26. When light rays enter the eye, most of the refraction occurs at the
(A) Crystalline lens
(B) Outer surface of the cornea
(C) Iris
(D) Pupil

27. Which of the following is not an application of ultrasound waves?
(A) X-ray of bones
(B) Echocardiography
(C) To detect defects in metal blocks
(D) To clean electronic components

28. A generator converts mechanical energy into electrical energy. It works on the principle of
(A) Electric field
(B) Magnetic field
(C) Magnetic induction
(D) Electromagnetic induction

29. In the given curve figure, half wavelength is

(A) AB
(B) BD
(C) DE
(D) AE

30. Which part of human ear converts the pressure vibrations into electrical signals?
(A) Stirrup
(B) Anvil
(C) Eardrum
(D) Cochlea

31. If the focal length of a spherical mirror is 20 cm. The radius of curvature of spherical mirror will be
(A) 10 cm
(B) 20 cm
(C) 30 cm
(D) 40 cm 

32. A copper sphere of mass 5 kg has the same diameter as an iron sphere of mass is 2 kg. Both spheres are dropped simultaneously from a tower. When they are 6 m above the ground, they have the same
(A) momenta
(B) potential energy
(C) acceleration
(D) kinetic energy

33. A short pulse of white light is incident from air to a glass slab at normal. After travelling through the slab, the first colour to emerge is
(A) Blue
(B) Green
(C) Violet
(D) Red

Chemistry

34. Average atomic mass of Bromine isotopes ₃₅Br⁷⁹ (49.7%) and ₃₅Br⁸¹ (50.3%) will be
(A) 80
(B) 85
(C) 75
(D) 70

35. Avogadro number is
(A) 6.022 × 10²²
(B) 6.022 × 10²³
(C) 6.022 × 10²⁴
(D) None of the above

36. Conversion of a solid directly into gas is called
(A) Condensation
(B) Fusion
(C) Sublimation
(D) Evaporation

37. The process in which carbonate ores are changed into oxides by heating strongly in controlled air
(A) Gangue
(B) Roasting
(C) Calcination
(D) Corrosion

38. What will be the mass of 3.8 litres of SO₂ at S.T.P.?
(A) 5.5 gram
(B) 5 gram
(C) 10.85 gram
(D) 8.5 gram

39. Say True or False.
i. Solid (heat) ⟶ Liquid
ii. Liquid (heat) ⟶ Gas
iii. Liquid (cool) ⟶ Solid
(A) True, False, True
(B) True, False, False
(C) True, True, True
(D) False, True, True

40. Heat energy required to change 1 kg of a liquid at its boiling point into gas at atmospheric pressure is called
(A) Latent heat of vaporisation
(B) Latent heat of fusion
(C) Heat content
(D) None of the above