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8 Which of the following precautions is NOT applicable to experiment involving planoconvex lens?
a) planoconvex lens should have small focal length b) parallax error should be avoided c) the surface of the lens should be cleaned properly d) the tip of the optical pin should be at the same level with the principal axis of the lens
9 A glass prism of refracting angle 60 degrees gives a minimum deviation of 47degrees. What is the refractive index of the glass? a) 1.61 (b) 1.20 (c) 1.52 (d) 1.41
14 In an experiment with a concave mirror, the image of an optical pin which is 4 times its size was cast on on a screen 6m from the object pin. How far from the object pin should the mirror be placed? a) 8m b) 6m c) 3m d) 2m
1 A convex mirror has a radius of 20 cm. An object is placed 30 cm in front of the mirror. Determine where the image will appear. (a) −4.5cm (b) −5.5cm (c) −6.5cm (d) −7.5cm
11 A current of 0.5A flowing through a wire produces 21J of heat in 1/2 min. The resistance of the wire is ----------- ohms to 1 place of decimal? (a)2.8Ω (b)3.2Ω (c)1.4Ω (d) 4.6Ω
14 The physical phenomenon which accounts for apparent depth of a pool of water is called? (a)waves (b) polariztion (c) diffraction (d) refraction
15 The ------------ of the eye plays an equivalent role of the screen in optical experiments? (a) lens (b) iris (c) optic nerve (d) retina
19 A 9V battery is short-circuited. The potential difference across the battery is found to be 8V, and the current is 5A. What is the internal resistance of the battery? (a) 0.1Ω (b) 0.2Ω (c)0.3Ω (d)0.4Ω
20 Ohm's law relates potential difference with? (a) power (b) Energy (c) current (d) time
, where b is the damping factor and all the symbols have their usual meaning?
a⃗ =−i⃗ −4j⃗ +2k⃗
b⃗ =3i⃗ +2j⃗ −2k⃗
c⃗ =2i⃗ −3j⃗ +k⃗
a⃗ ⋅(b⃗ ×c⃗ )
due east and then
. Find his resultant displacement.