161- The rate of change of linear momentum of a body is equal to:
A. Net force
B. Net torque
C. Net inertia
D. Net velocity
View Answer
Answer : A. Net force
Description
162- The most appropriate mathematical expression representing simple harmonic motion is:
A. a =- x
B. a =kx
C. a ∝ x
D. a ∝- x
View Answer
Answer : D. a ∝- x
Description
163- A body is moving in a circle with constant speed, with radius of circle is ‘r’ and time period ‘T’ the centripetal acceleration is given by ?
A. 4πr^2/T^2
B. 4πr^2/T
C. 4πr/T
D. 4π^2r/T^2
View Answer
Answer : D. 4π^2r/T^2
Description
164- The kinetic energy of an electron in the first Bohr radius of an H-atom is:
A. 13.6 eV
B. -13.6 eV
C. 13.6 keV
D. 13.6 kJ
View Answer
Answer : A. 13.6 eV
Description
165- Lenz's law is a form of the:
A. Law of conservation of momentum
B. Law of conservation of charge
C. Law of conservation of energy
D. Law of conservation of mass
View Answer
Answer : C. Law of conservation of energy
Description
166- The rate of doing work is zero, when the angle 0 between force and velocity is:
A. θ = 0°
B. θ = 45°
C. θ = 90°
D. θ = 180°
View Answer
Answer : C. θ = 90°
Description
167- Half-life of a radioactive sample is given by:
A. T ½= √ (0.693)
B. T ½=(0.693) λ
C. T ½=(0.693) / √ λ
D. T ½=(0.693) / λ
View Answer
Answer : D. T ½=(0.693) / λ
Description
168- Two similar point charges each of 1C placed in free space 1m apart repel each other with a force of:
A. 1.602 x 10^-19 N
B. 9 x10^9 N
C. 8.85 x10^-12 N
D. 6,67 x 10^-11 N
View Answer
Answer : B. 9 x10^9 N
Description
169- In a nuclear reaction equation, the missing particle is:
A. Proton
B. Alpha particle
C. Electron
D. Neutron
View Answer
Answer : A. Proton
Description
170- The potential difference applied across a diode to reduce the depletion layer is:
A. Reverse biasing
B. Forward biasing
C. Biasing voltage
D. Junction potential
View Answer
Answer : B. Forward biasing
Description
171- A charged particle of mass ‘m’ and charge ‘q’ is projected in a magnetic field of induction ‘B’ at an angle ‘6’. The radius of curvature of its curved path is given by:
A. r = mv cosθ / qB
B. r = mv sinθ/ qB
C. r = mvB / q
D. r = mv / qB sinθ
View Answer
Answer : B. r = mv sinθ/ qB
Description
172- Specific heat capacity of a gas is measured in:
A. J.kg^-1.K
B. J.kg^-1.K-1
C. J.kg.K^-1
D. J.kg.K
View Answer
Answer : B. J.kg^-1.K-1
Description
173- First law of thermodynamics is mathematically represented as:
A. ΔU =ΔW – ΔQ
B. ΔQ =ΔU – ΔW
C. ΔU =ΔQ – ΔW
D. ΔQ =ΔW – ΔU
View Answer
Answer : C. ΔU =ΔQ – ΔW
Description
174- The angular momentum of a particle changes from 0 to 720 J.s in 4s. The magnitude of torque is:
A. 180 Nm
B. 360 Nm
C. 1440 Nm
D. 90 Nm
View Answer
Answer : A. 180 Nm
Description
175- An object moving faster than the speed of sound is called:
A. Sonic
B. Supersonic
C. Ultrasonic
D. Infrasonic
View Answer
Answer : B. Supersonic
Description
176- If a slab of dielectric constant \(E_r = 2\) is inserted between the parallel plates of a 20 µF capacitor, its capacitance will ?
A. Remain the same
B. Be doubled
C. Become zero
D. Be halved
View Answer
Answer : B. Be doubled
Description
177- Fill in with the appropriate preposition: We saw a cricket match ______ the school stadium.
A. In
B. Over
C. At
D. On
View Answer
Answer : C. At
Description
178- I ______ an appointment with the dentist soon.
A. Made
B. Make
C. Making
D. Had Make
View Answer
Answer : B. Make
Description
179- Due to his negligence, he failed in the exam.
A. He failed
B. In the examination
C. His negligence
D. No error
View Answer
Answer : D. No error
Description
180- Which sentence uses capital letters correctly?
