Physics Set 19 FAQs

1. The chemical action within a cell generates:

2. The unit hertz is named after the discoverer of:

3. Consider the following statements about Rutherford's conclusions: (I) The positive charge is concentrated in a very small volume. (II) The nucleus occupies most of the volume of the atom. (III) The nucleus contains most of the mass of the atom. Which of the above is/are correct?

4. An object moving in a straight line travels equal distances in equal intervals of time, for all choices of intervals. Its speed is:

5. The SI unit of the coefficient of viscosity is:

6. The potential energy of a 4 kg object at a height of 6 m (g = 10 m s⁻²) is:

7. When an object is placed at the principal focus of a concave mirror, the image is formed at:

8. Two lenses of power +3.0 D and −1.5 D are placed in contact. The net power is:

9. In steady flow, two streamlines can never:

10. Consider the following statements: (I) The unit of plane angle is radian, with symbol rad. (II) The unit of solid angle is steradian, with symbol sr. (III) Plane angle is the ratio of the intercepted area of a spherical surface to the square of its radius. Which of the above is/are correct?

11. Dimensional analysis shows that the time period T of a simple pendulum of length l, at a place with acceleration due to gravity g, is proportional to:

12. The General Conference on Weights and Measures revised the SI in November of:

13. Near the surface of the Earth, the acceleration due to gravity is nearly:

14. In the New Cartesian Sign Convention, the origin is taken at the:

15. Among the good electrical conductors, the metal mainly used for making electrical wires owing to its lower cost and abundant supply is:

16. The coefficient of volume expansion αv and the coefficient of linear expansion αl of a solid are related as:

17. The period of the function sin 2ωt + cos 4ωt is:

18. For an object placed at 2F₁ of a convex lens, the image is formed at:

19. One horsepower is equal to:

20. Heavier atoms need many more neutrons than protons because neutrons:

21. The planetary observations from which Kepler's laws were extracted were compiled by:

22. In India, the Big Dipper is known as:

23. The escape speed from the surface of the Earth, in terms of g and the radius R of the Earth, is:

24. An athlete runs 80 m along a straight track and then returns 50 m along the same path. The total distance travelled and the magnitude of displacement are:

25. An iron rod of length 5.0 m is heated through 50 K. If αl = 1.2 × 10⁻⁵ K⁻¹, the increase in its length is:

26. Ohm's law holds for a metallic wire provided its ___ remains the same:

27. Consider the following statements: (I) Seasons occur because of the tilt of the Earth's axis and its spherical shape. (II) Seasons occur because the Earth is closer to the Sun in summer than in winter. (III) The Earth is closest to the Sun in January. Which of the above is/are correct?

28. Consider the following statements: (I) Clearing forests reduces transpiration and can lower local rainfall. (II) Without tree roots to hold the soil, soil erosion could increase. (III) Deforestation increases the rate of photosynthesis. Which of the above is/are correct?

29. The result that any periodic function can be expressed as a superposition of sine and cosine functions was proved by:

30. Most of the refraction of light entering the human eye occurs at the: