UKSSSC Police Head Constable (Mukhya Aarakshi) Telecommunication Exam 31 July 2022 (Official Answer Key)

81. If A = , then A^-1 will be:
(A)

(B)

(C)

(D)

82. The value of determinant will be
(A) 5²
(B) 5⁹
(C) 0
(D) 5¹³

83. The median of a given frequency distribution can be found graphically with the help of:
(A) Histogram
(B) Frequency curve
(C) Frequency polygon
(D) Ogive

84. Which of the following Diode is used as a voltage regulator?
(A) Photo Diode
(B) Light Emitting Diode
(C) Solar cell
(D) Zener Diode

85. If in Young’s Double Slit Experiment, the distance between the two slits is doubled and the distance between the slit and screen is also doubled, then the fringe width will become :
(A) Remained same
(B) Double
(C) Four times
(D) Half

86. Which of the following remains constant in a simple harmonic motion?
(A) Restoring force
(B) Acceleration
(C) Displacement
(D) Mechanical energy

87. If Z is a complex number then:
(A) |Z²| > |Z|
(B) [Z²] = |Z²|
(C) |Z| < |Z|²
(D) |Z²| ≥ |Z|²

88. In summer, when the valve of a bicycle tube is removed, the escaping air appears cold because
(A) Isothermal expansion
(B) Adiabatic expansion
(C) Isothermal compression
(D) Adiabatic compression

89. In an open organ pipe, there may be
(A) only odd harmonics
(B) only even harmonics
(C) even and odd harmonics
(D) None of the above

90. If the mass of a solid sphere is M and its radius is R, then the moment of inertia of the tangent parallel to the diameter on the surface of that sphere will be:
(A)

(B)

(C)

(D)

91. A = [aij]_{m x n} will be a square matrix, if:
(A) m < n
(B) m > n
(C) m = n
(D) None of the above

92. The amount and nature of charge on conductor having 1500 excess of electrons will be :
(A) 1.6 x 10^-19, positive charge
(B) 1500 coulomb, negative charge
(C) 2.4 x 10^-16 coulomb, positive charge
(D) 2.4 x 10^-16 coulomb, negative charge

93. If f : R→ R be defined by f(x) = 3x² – 5 and g : R→ R by g(x) = x/(x² +1), then gof is :
(A)

(B)

(C)

(D)

94. The probability that an ordinary year has 53 Mondays is:
(A) 2/7
(B) 1/7
(C) 7/52
(D) 7/53

95. If and are two vectors, then which of the following statement is not true.
(A)
(B)
(C)
(D)

96. Moving from equator to poles, the value of acceleration due to gravity (g):
(A) Not changed
(B) Decreases
(C) Increases
(D) Decreases upto 45° latitude

97. On increasing the mass of the particle, the value of de-Broglie wavelength is :
(A) increases
(B) remains unchanged
(C) decreases
(D) none of the above

98. The fluid rises in the capillary tube if angle of contact is :
(A) obtuse angle θ > 90°
(B) acute angle θ < 90°
(C) θ = 90°
(D) θ = 180°

99. The velocity at the highest point of projectile will be:
(A) u cos θ /g
(B) u cos θ
(C) u sin θ /g
(D) None of the above

100. The number of terms in the expansion of (1 + 3x + 3x² + x³)²⁰ will be:
(A) 61
(B) 60
(C) 52
(D) None of the above