Neco Physics 2005 Past Questions and Answers

Question 21:

• NECO 2005

An object is placed in front of a concave mirror whose radius of curvature is 12cm. If the magnification of the Image produced is 1.5, how far is the object from the mirror?

A. 8cm
B. 10cm
C. 15cm
D. 18cm
E. 20cm

Question 22:

• NECO 2005

A body moves along a circular path with uniform angular speed of 0.6 rad s^-1 and at a constant speed of 3.0 ms^-1.

Calculate the acceleration of the body towards the centre of the circle.

A. 0.2.ms^-2
B. 1.8 ms^-2
C. 5.0 ms^-2
D. 5.4 ms^-2
E. 25.0 ms^-2

Question 23:

• NECO 2005

Which of the statements is/are true of two bodies involved in an inelastic collision? After collision.

I. the kinetic energy increases
II. The momentum decreases
III. Their velocities are the same.

A. I only
B. II Only
C. III only
D. I and II only
E. II and III only

Question 24:

• NECO 2005

491 K is equivalent to ____________

A. 273 °C
B. 218 °C
C. 373 °C
D. 491 °C
E. 764 °C

Question 25:

• NECO 2005

An atom radiates 1.5 × 10^-19J when an electron jumps from one level to another. What is the wavelength of the emitted radiation? (Planck’s constant 6.6 × l0^-34Js ; Speed of light in vacuum = 3.0 × 108ms^-1)

A. 1.32 × 10^-6m
B. 2.97 × 10^-6m
C. 3.30 × 10^-6m
D. 6.82 × 10^-6m
E. 8.01 × 10m^-6