A magnifying glass of focal length 5 cm is used to view an object by a person whose smallest distance of distinct vision is 25 cm. If he holds the glass close to eye, then […]
The approxiamate ratio of nuclear mass densities of ₇₉Au¹⁹⁷ and ₄₇ Ag¹⁰⁷ nuclei is
Options
(a) (197:107) (b) (47:79) (c) (79:47) (d) (1:1)
Correct Answer:
(1:1)
Explanation:
No explanation available. Be the first […]
A wire is suspended vertically from one of its ends is stretched by attaching a weight of 200 N to the lower end. The weight stretches the wire by 1 mm. Then the elastic energy […]
If the temperature of the sun were to increase from T to 2T and its radius from R and 2R, then the ratio of the radiant energy received on earth to what it was previously […]
The amplitude of S.H.M. y=2 (sin 5πt+√2 cos 5πt) is
Options
(a) 2 (b) 2√2 (c) 4 (d) 2√3
Correct Answer:
2√3
Explanation:
No explanation available. Be the first to write the explanation […]
The point of suspension λ of a simple pendulum with normal time period T₁ is moving upward according to equation y=kt² where k=1 m/s². If new time period is T² the ratio T₁²/T₂² will be […]
A thin rod of length L and mass M is held vertically with one end on the floor and is allowed to fall. Find the velocity of other end when it hits the floor, assuming […]
Angular momentum of the particle rotating with a central force is constant due to
Options
(a) Constant torque (b) Constant force (c) Constant linear momentum (d) Zero torque
Correct Answer:
Zero torque
Explanation: […]
A bullet emerges from a barrel of length 1.2 m with a speed of 640 ms⁻¹. Assuming constant acceleration, the approximate time that it spends in the barrel after the gun is fired is
The circular motion of a particle with constant speed is
Options
(a) Periodic but not simple harmonic (b) Simple harmonic but not periodic (c) Period and simple harmonic (d) Neither periodic not simple harmonic
2017-2025 Copyright Doctor Dreams Training Academy - About Us - Privacy Policy - Terms & Conditions - Contact Us - Refund Policy