Mock Test-1 (Paper-1) (Question 51-100)

Total Questions: 50

21. If an apple is released from an orbiting spaceship, it will

Correct Answer: (c) move along with the spaceship at the same speed
Solution:Due to the lack of gravitational force the apple so released will move by the same speed as the spaceship.

22. A car is moving on a circular path and takes a turn. If R₁ and R₂ be the reaction on the inner and outer wheels respectively, then

Correct Answer: (b) R₁ < R₂
Solution:It has been calculated in the theory of the chapter i.e.,

R₁ = (mg)/2  (1 - v²h/rga)

and R₂ = (mg)/2  (1 + v²h/rga), so R₁ < R₂

23. When light passes from one medium to another medium, which one of the following does not change?

Correct Answer: (d) Frequency
Solution:When light passes from one medium to another medium frequency does not change.

24. Night vision cameras do not use

Correct Answer: (d) X-ray radiation from objects
Solution:Night vision cameras have three important features namely amplified light, infrared sensors as well as heat radiation from objects. While, x-rays radiations from objects are nit used by these cameras.

25. A swimming pool looks shallower than it really is, when seen by a person standing outside near it, because of the phenomenon of

Correct Answer: (a) refraction of light

26. How many images will be formed if a point light source is placed between two parallel plane mirrors?

Correct Answer: (d) Infinite
Solution:When any object or point light source is placed between two  parallel plane mirrors, infinite images will be formed as it undergoes multiple reflection to produces the infinite images.

27. A lens has a power of +2.0 Dioptre. Which one of the following statements about the lens is true?

Correct Answer: (c) The lens is convex and has a focal length of 0.5 metre
Solution:A dioptre, is a unit of measurement of the optical power of a lens, which is equal to the reciprocal of the focal length measured in meters (that is, 1/f metres). It is thus a unit of reciprocal length.

Hence, P = 1/f ⇒ 2 = 1/f ⇒ 0.5 meter.

as the value is positive, it is a positive lens, that is, convex.

Hence, the option (c) is true.

28. Methane is a colourless, odourless, non-toxic but flammable gas. What is its common name ?

Correct Answer: (d) Marsh gas
Solution:The chemical name for methane is tetrahydridocarbon. Other common names for methane include marsh gas methyl hydride, biogas, fire damp and many more. The chemical formula formal for methane is CH₄.

29. 'Yellow Cake' an item of smuggling across border is

Correct Answer: (c) uranium oxide
Solution:Yellow cakes generally denotes various compounds of uranium like uranium oxides.

30. Which of the following is likely to reach our body via the food chain in the event of an atomic bomb explosion?

Correct Answer: (a) U-235
Solution:Atomic bomb is a nuclear bomb that involves nuclear fission reactions. The most common isotopes and for fissile reactions are uranium (U-235) and plutonium (P-239). So in the event of an atomic bomb explosion, the most likely element that would enter the food chain us U-235, among the options.