initial displacement
initial velocity
acceleration
half the acceleration
half the initial velocity
Correct answer is C
No explanation has been provided for this answer.
What is the number of neutrons in the Uranium isotope \(^{238}_{92}X\)?
92
146
238
330
119
Correct answer is B
No of neutrons = 238-92
=146
Which of the following features is NOT a characteristic of natural radioactivity?
Radioactivity is a nuclear phenomenon
Radioactivity is exhibited only by elements of mass number greater than 206
The radioactivity of an element is affected by electric and magnetic fields in the surroundings
Radioactive substances emits three types of radiations, a-rays, \(\beta\)-rays and y-rays
The radioactive element is transformed into a new element
Correct answer is B
Natural radioactivity is exhibited by elements of atomic numbers of 83 or more
Which of the following statements is NOT correct?
The average range of distinct vision for a normal eye is from the far distance (infinity) up to about 25cm in front of the eye
Longsighted people have difficulty in making the eye lense sufficiently powerful to focus on nearby objects
Shortsighted people cannot accommodate distant objects
Longsighted people need diverging spectacle lenses
A person with long sight has his eye-ball too short and the image of an object is therefore formed behind the retina
Correct answer is D
No explanation has been provided for this answer.
Which of the following statements about electrolysis is NOT correct?
The substances in solution in the electrolyte become ionized
Ions are electrically charged and are attracted towards electrodes when a potential difference is applied
Ions may be discharged at the electrodes, forming bubbles or deposits
The mass deposited depends upon the length of time for which current flows
The mass of gas set free or metal deposited is proportional to the square of the current
Correct answer is E
No explanation has been provided for this answer.