SMATEE TEST SERIES 14 PHYSICS

1. The addition of 22.148 and 5.36 with regards to significant figures is

a) 27.508
b) 27.50
c) 27.51
d) 27.52

2. A result of cross product of two vectors is zero, this implies the vectors are

a) perpendicular
b) parallel
c) mutually exclusive
d) mutually inclusive

4. Two bodies of masses 1 kg and 2 kg, moving with velocities 5 m/s and 10 m/s collide with each other in opposite direction. After collision the first body moves with a velocity of 3 m/s. The velocity of the second body is

a) 11 m/s

b) 20 m/s

c) 6 m/s

d) none

5. The scalar product of two vectors is minimum when the angle between them is

a) 0º
b) 90º
c) 60º
d) 180º

6. Choose the incorrect statement for inelastic collision

a) both momentum and KE is conserved
b) only momentum is conserved
c) KE is not conserved
d) none

7. The forces which obey the inverse square law are examples of

a) non-conservative forces
b) conservative forces
c) nuclear forces
d) equilibrium forces

8. The range of a projectile fired at some angle to the horizontal becomes maximum when the angle of projection is

a) 90º
b) 30º
c) 45º
d) 0º

9. Steel is more elastic than rubber because it:

a) requires larger deforming force
b) is never deformed
c) is deformed very easily
d) is harder than rubber

10. The angle between incident ray and reflected ray is 60°. What is the value of angle of incidence?

a) 60°
b) 30°
c) 90°
d) 1200°

11. A metallic rod of length l and cross – sectional area A is made of a material of Young’s modulus Y. If the rod is elongated by an amount y, then the work done is proportional to

a) y
b) 1/y
c) y²
d) 1/y²

12. The displacement of a particle is represented by the equation y=sin³ωt. The motion is

a) non-periodic
b) periodic but not simple harmonic
c) simple harmonic with period 2π/ω
d) simple harmonic with period π/ω

13. Which of the following wave does not travel in vacuum?

a) Seismic waves
b) X-rays
c) Light
d) Radio waves

14. A light bulb is rated at 100 W for a 220 V ac supply. The resistance of the bulb is

a) 284Ω
b) 384Ω
c) 484Ω
d) 584Ω

15. The primary origin(s) of magnetism lies in

a) atomic current and intrinsic spin of electrons-
b) polar and non-polar nature of molecules.
c) Pauli exclusion principle.
d) electronegative nature of materials.

16. Light of wavelength λ falls on metal having work functions hc/λ0. Photoelectric effect will take place only if:

a) λ≥λ0
b) λ≤λ0
c) λ≥2λ0
d) λ=4λ0

17. The phenomena involved in the reflected of radio waves by ionosphere is similar to.

a) reflection of light by a plane mirror.
b) total internal reflection of light in air during a mirage.
c) dispersion of light by water molecules during the formation of a rainbow.
d) scattering of light by particles of air.

18. Intensity of an electric field (E) depends on distance r, due to a dipole, is related as

19. The electric field inside a spherical shell of uniform surface charge density is

a) zero
b) constant different from zero
c) proportional to the distance from the curve
d) None of the above

20. The number of electric lines of force that radiate outwards from one coulomb of charge in vacuum is’

a) 1.13 × 10¹¹
b) 1.13 × 10¹⁰
c) 0.61 × 10¹¹
b) 0.61 × 10⁹