UNIZIK Physics 2014/2015 Day 3 Past Questions

Practice each question, then open it to see the full details.

Mercury is a better barometric liquid because:
i. It needs no colouring
ii. Its density is many times that of water
iii. It does not wet glass
iv. It has a high vapour pressure
v. It has a high boiling point
Which of the above statements arc true?

A.i and ii only
B.i, ii and iii only
C.iii and iv only
D.iv and v only
E.iii, iv and v only.

If the wavelength of a wave traveling with a velocity of 360m/s is 60cm, the period of the wave is

A.0.5s
B.1s
C.0.0017s
D.0.0046s
E.0.3s

Concerning electrical charge:

A.Positive charge means deficit of electrons
B.Negative charge means excess of electrons
C.Electric current means movement of electrons
D.All of the above
E.A and C only.

An electric current can produce all these effects EXCEPT:

A.Heat
B.light
C.sound
D.motion
E.none of the above

Ripples on water are similar to light waves since both:

A.Have the same wavelength
B.are longitudinal waves
C.can be refracted and diffracted
D.travel at the same speed

The primary coil of a transformer is 500 turns while the secondary coil is 2500 turns. The voltage input to the primary coil is 120V. what will the output be? Which of these quantities arc scalars?
I. Electric potential energy
II. Torque
III. Momentum
IV. Kinetic energy

A.300V
B.400V
C.500V
D.600V
E.800V

The e.m.f of an eletrical generator is 240V and its internal resistance is 1 ohms. If the current supplied by generator is 20A when the terminal voltage is 220V. Find the ratio of the power supplies to the power dissipated.

A.11:1
B.1:11
C.12:11
D.11:12
E.1:23

Step down transformer has a power output of 50W and efficiency of 80%. If the mains vow is 200V, calculate the primary current of the transformer.

A.0.31A
B.0.25A
C.1.00A
D.4.00A
E.0.62A

Impulse has the same dimension as one of these physical quantities:

A.surface tension
B.momentum
C.surface tension
D.pressure
E.none of the above