A ball is dropped from a height of 45m above the ground. Calculate the velocity of the ball just before it strikes the ground. (Neglect air resistance and take g as 10ms^?2

• A. 21.2ms^?1
• B. 30ms^?1
• C. 300ms^?1
• D. 450ms^?1

An image which can be formed on a screen is said to be

• A. virtual
• B. blurred
• C. inverted
• D. real

The hydrostatic blood pressure difference between the head and the feet of a boy standing straight is 1.65 x 104 Nm-2. Find the height of the boy. [ Density of blood = 1.1 x 103 kgm-3, g = 10ms-2]

• A. 0.5 m
• B. 0.6 m
• C. 1.5 m
• D. 2.0 m

A body weighing 10N moves with a speed of 5ms^-1 in a horizontal circular path of radius 5m. Calculate the . magnitude of the centripetal force acting on the body. (g = 10ms^-2)

• A. 10N
• B. 50N
• C. 75N
• D. 100N

I. Density of the liquid.

II. Depth below the surface of the liquid.

III. Surface area of the liquid.

In which of the statement above will pressure be dependent?

• A) I and II only
• B) II and III only
• C) I, II and III only
• D) I and III only

A uniform meter rule weighing 0.5N is to be pivoted on a knife-edge at the 30cm-mark. where will a force of 2N be placed from the pivot to balance the meter rule?

• A. 95cm
• B. 25cm
• C. 20cm
• D. 5cm

When a body is slightly tilted, it is found that its centre of gravity is slightly raised. What is the state of equilibrium of the body?

• A. unstable
• B. stable
• C. neutral
• D. cannot be determined

An electric generator has e.m.f. of 240 V and an internal resistance of 1Ω if the current supplied by the generatoris 20A when the terminal voltage is 220 V, find the ratio of the power supplied to the power dissipated?

• A) 11:1
• B) 1:11
• C) 12:11
• D) 11:12

A barometer can be used in determining the I. height of a mountain II. depth of a mine III. dew point. Which of the following is/are correct?

• A. I, II and III
• B. II and III only
• C. I and III only
• D. I and II only

Arrange the following radiations in order of increasing ionization of air.

I. Alpha

Il. Gamma

IIl. Beta

• A. I< III< II
• B. II< I< III
• C. II< III< I
• D. I< II