Pioneer 5116 Scphy_prelim2009_paper1

Paper 1

(20 marks)

Each question has four suggested answers, A, B, C, D; Only one is correct. Read the answers and then select the one you think is correct. Answer all the questions. 1

A pair of vernier calipers is used to measure the width of a metal cube and the following reading is obtained. 8

9

cm 0

`

10

What is the width of the metal cube? A B C D

2

5

8.34 cm 8.36 cm 8.38 cm 8.90 cm

The diagram shows a simple pendulum oscillating between positions X and Z. It takes 1.4 s to swing from Y to Z.

What is the time taken for the pendulum to make half an oscillation?

A B C D

0.7 s 1.4 s 2.8 s 5.6 s

2

3

A block of mass 20 kg is pushed along a road with a force of 30 N. The frictional force is 10 N.

What is the acceleration of the block? A C

4

5

0.67 m/s2 1.5 m/s2

B D

1.0 m/s2 2.0 m/s2

The speed of a body during 20 s of motion is represented by the velocitytime graph shown. What distance does the body travel during this motion.

A

100 m

B

150 m

C

200 m

D

300 m

The top surface of a tap has a surface area of 5.00 cm2. How much force should be applied in order to exert a pressure of 15 Pa on the top of the tap? A

0.0075N

B

3N

C

75N

D

30 000N

3

6

In Singapore, all drivers and passengers are required by law to put on seat belts while travelling in a car. This is due to the effect of ____________ which will endanger their lives when the brakes are applied suddenly. A B C D

7

air resistance friction gravity inertia

The figure shows three beakers containing three different liquids.

liquid 1

liquid 2

liquid 3

Which statement about the densities of the liquids is correct? A B C D 8

Liquid 1 has twice the density of liquid 3. Liquid 3 has twice the density of liquid 2 All the liquids have different densities. All the liquids have the same densities.

The diagram below shows a pivoted uniform bar. The bar is in equilibrium under the action of the forces shown. What is the magnitude of the force F ? 6N

F

10 N

4m

2m

A.

2N

B.

4N

C.

8N

D.

14 N

2m

4

9

A ball of mass 0.6 kg rolls down a hill. At 2.0 m above the bottom of the hill the speed of the ball is 3 m/s.

What is the kinetic energy of the ball at the bottom of the hill? (Take the gravitational field strength as 10 N/kg and ignore any effects of friction.) A C

10

B D

12 J 14.7 J

Which one of the following does not describe the characteristics of gas molecules? A B C D

11

2.7 J 12.9 J

All molecules move with the same velocity. The average velocity of the molecule remains constant if temperature of the gas is constant. The kinetic energy each molecule possesses is not constant. When a gas is cooled, molecules lose energy and cluster together to become molecules in liquid phase.

The freezer in the refrigerator is fitted near the top _______________. A B C D

to keep it away from the hot compressor which is near the bottom because conduction cannot take place when the freezer is kept at the bottom so that it can cool the whole interior by setting up convection currents because of convenience

5

12

A solid substance in a boiling tube was heated steadily. The temperaturetime graph of the substance is shown in the diagram below. Which section of the graph indicates the substance being a mixture of gas and liquid? Temperature

R P

S

Q

O

Time A

13

B

PQ

C

QR

D

RS

Which of the following has the lowest frequency?

A B C D 14

OP

Microwaves Radiowaves Visible light X-rays

The amplitude of a sound wave is increased while its frequency is decreased. How are the loudness and pitch of the sound affected? Loudness

Pitch

A

increased

lowered

B

increased

raised

C

decreased

lowered

D

decreased

raised

6

15

The figure below shows two rays of light entering a glass block.

y

w

x

z

p

q

Which equation is correct? I

w y = x z

III

sin w sin q = sin x sin p

II

sin y sin p = sin z sin q

IV

sin x sin z = sin w sin y

A B

III and IV I and II

C D

II and III II and IV

7

16

The figure below represents the electric field lines in the vicinity of two isolated electric charges, A and B

B

A

Which statement identifies the charges of A and B? A B C D

17

The potential difference between the ends of a conductor is 12 V. How much electrical energy is converted to other forms of energy in the conductor when 100 C of charge flows through it? A C

18

A is negative and B is positive A is positive and B is negative A and B are both positive A and B are both negative

0.12 J 88 J

B D

8.3 J 1 200 J

A conductor of resistance R has cross sectional area A and length L. What would have been the resistance if the conductor now has both the area and the length doubled? A

0.5R

B

R

C

2R

D

4R

8

19

A permanent magnet can be demagnetised by using a solenoid and switching the current on then off. Which diagram shows the most effective method of producing demagnetisation?

20

The diagram shows a current in a conductor in a magnetic field.

current in a conductor

What is the direction of the force on the conductor? A B C D

Into the page Out of the page Towards the N-pole Towards the S-pole

END OF PAPER 1 9