UKPSC Preliminary Exam Paper I (General Studies) – 14 July 2024 (Official Answer Key)

71. Consider a tightly wound 100 turn coil of radius 10 cm, carrying a current of 1A. What will be the magnitude of the magnetic field at the centre of the coil?
(d) 6.82 x 10^-2 T
(a) 6.28 × 10^-4 T
(b) 6.28 × 10^-3 T
(c) 2.68 x 10^-2 T

72. Two slits are made one millimetre apart and the screen is placed one metre away. What is the fringe separation when blue-green light of wavelength 500 nm is used?
(a) 0.5 m
(b) 0.5 mm
(c) 50 mm
(d) 50 m

73. What will be the de Broglie wavelength of a ball of mass 0.12 kg moving with a speed of 20 ms-1 ?
(a) 6.63 × 10^-30 m
(b) 6.63 x 10^-34 m
(c) 2.76 x 10^-30 m
(d) 2.76 x 10^-34 m

74. Food cans are coated with Tin instead of Zinc, because
(a) Zinc is expensive than Tin.
(b) The melting point of Zinc is higher than Tin.
(c) Zinc is more reactive than Tin.
(d) Zinc is less reactive than Tin.

75. As per census 2011, which of the following district of Uttarakhand had lowest female literacy rate?
(a) Haridwar
(b) Udhamsingh Nagar
(c) Uttarkashi
(d) Tehri Garhwal

76. Which one of the following is the highest reactive metal ?
(a) Sodium
(b) Potassium
(c) Calcium
(d) Iron

77. The Geographical regions which are particularly rich in endemic, rare and threatened species, found relatively in small areas and facing significant habitat loss are referred to as
(a) Red spots
(d) Wet spots
(c) Hot spots
(b) Glow spots

78. Organisms which grow best in the temperature range of 0-15 °C are referred to as:
(a) Thermophiles
(b) Psychrophiles
(c) Hydrophiles
(d) Mesophiles

79. Which Constitutional Amendment Act relates to the protection and improvement of environment and safeguarding of forests and wildlife?
(a) 1972
(b) 1974
(c) 1976
(d) 1978

80. Which of the following helps some hydrophytes to thrive in wetlands and marshes where water level fluctuates time to time?
(a) Rhizomatous roots
(b) Submergent roots
(c) Aerenchyma tissue
(d) Rhizophores