Scientific Reasoning MCQs

Question 1

Echinoderms are defined as various invertebrate marine animals characterized by a hard, spiny covering or skin. They have attracted much attention due to their extensive fossil record, ecological importance, and unusual body forms. Although most echinoderms are extinct, many living representatives still exist. All living echinoderms have an internal skeleton and a central body cavity, but their outward appearance can vary significantly. For example, starfish and brittle stars have arms that extend from a central disk; sea lilies have a central stalk, or stem, and resemble flowers; and sea cucumbers are wormlike and tend to burrow. The ways in which echinoderms move and feed are as diverse as their body forms. Table 1 lists certain echinoderms and their methods of locomotion (movement) and feeding. Table 2 includes examples of echinoderm habitats around the world. According to Table 1 and Table 2, crinoids can be found feeding on plankton.

Accepted Answer

in offshore mud and ooze

Answer

near the shore

Answer

in deep ocean trenches

Answer

on the deep-sea floor

Question 2

Suppose scientists discover a new echinoderm that uses its tube feet to move across the deep-sea floor as it hunts for prey. This newly discovered echinoderm can most likely be classified as a(n):

Accepted Answer

Asteroid.

Answer

Crinoid.

Answer

Holothurian.

Answer

Ophiuroid.

Question 3

The instrument shown is used to study:

Accepted Answer

The flight pattern of birds

Answer

Cell organelles

Answer

Movement of stars in galaxies

Answer

Old manuscripts

Answer

Human vision defects

Question 4

When the thermometer was in the 40°C water, in the time interval between 0 sec and 2 sec, approximately how rapidly, in °C/sec, was the temperature registered by the thermometer changing?

Accepted Answer

5°C/sec.

Answer

1°C/sec.

Answer

10°C/sec.

Answer

40°C/sec.

Question 5

The three basic crystal structures are called Hexagonal Close Packed (HCP), Face Centered Cubic (FCC) and Body Centered Cubic (BCC).Shown below are alternative representations of the structures in Figure 1.The order in which they are represented is:

Accepted Answer

BCC, HCP, FCC

Answer

BCC, FCC, HCP

Answer

FCC, HCP, BCC

Answer

HCP, BCC, FCC

Question 6

A pantograph is a four-bar linkage mechanism used for drawing. It consists of two long bars and two short bars pivoted to one another so that they can move freely in the plane. In the version shown in Figure 3 below the short bars are half the lengths of the long ones.The point O is held fixed. There is a pointer at X and a pencil at Y. As the pointer at X is traced over a shape, the pencil at Y draws the shape enlarged by a factor of two.In Figure 3 if O and Q are both held fixed, the point Y.

Accepted Answer

can move in a straight line

Answer

cannot move

Answer

can move on a circular path

Answer

can move freely

Question 7

An ideal gas is a hypothetical gas whose pressure - volume - temperature behavior can be completely accounted for by the ideal gas equation (General gas equation). The molecules of an ideal gas do not attract or repel one another, and their volume is negligible compared with the volume of the container. Experiments show that under the STP conditions, one mole of an ideal gas occupies a volume of 22.4dm3.A tin can is sealed at a pressure of 100mmHg. If the can is taken to STP, the can may:

Accepted Answer

Collapse

Answer

Explode

Answer

Get larger

Answer

Get chilled

Question 8

It is generally well known that on average we are taller than our ancestor; this is true of people in various places around the world.The people of the Netherlands, now the world's tallest, have been on an upward trend since 1851, though the rate of growth accelerated after the second world war. In 1965, the average Dutchman was 1.78m tall. By 1997, he was 6cm taller. The average Dutch woman grew from 1.66m to 1.71m.The Spanish grew 2.4cm per decade between 1960 and 1990. In Western Europe this growth has now slowed to about 1cm per decade but Western Europe and Japan are increasing by up to 3cm per decade. However, on average, women are increasing in height more slowly than men so the gap in height between the sexes is widening.It has been found that it is the first two years of life which are the most important for height, when the leg bones are growing rapidly. Not only increased food supply but also general health improvement brought about antibiotics and vaccinations have had an effect. Your final height, however, is still dependent on the height of your parents and grandparents.Between 1960 and 1990 the average height of a Spaniard increased overall by about

Accepted Answer

7.2cm

Answer

3cm

Answer

5cm

Answer

10cm

Question 9

Given below is part of a circuit diagram.If the resisters R1 = 5 ohms, R2 = 2 ohms, R3 = 4 ohms, R4 = 12 ohms, R5 = 5 ohms and the current passing through the circuit is 10 amperes. What is the potential difference across b and c?

Accepted Answer

62V

Answer

112V

Answer

58V

Answer

280V

Question 10

If gear (2) moves clockwise, then which of the following directions will be similar to the direction of gear (4)?

Accepted Answer

Direction of (2) and (5)

Answer

Direction of (1) and (2)

Answer

Direction of (1), (3) and (5)

Answer

Direction of (1), (2) and (5)

Question 11

If the given crank shaft moves clockwise, then in which directions will the alternator and the fan move?

Accepted Answer

Clockwise and anti-clockwise respectively.

Answer

Both move anti-clockwise.

Answer

Anti-clockwise and clockwise respectively.

Answer

Both move clockwise.

Question 12

Why is copper used in household wiring?

Accepted Answer

Good conductivity and ductility

Answer

High resistivity

Answer

Magnetic properties

Answer

Reacts with water

Question 13

The rise of mercury in a thermometer is due to:

Accepted Answer

Thermal expansion

Answer

Gravity

Answer

Condensation

Answer

Capillary action

Question 14

If the 3 trials could be run simultaneously on parallel setups, in what order, from first to last, would the carts get to point B?

Accepted Answer

Trial 3, Trial 2, Trial 1

Answer

Trial 1, Trial 2, Trial 3

Answer

Trial 2, Trial 1, Trial 3

Answer

Trial 3, Trial 1, Trial 2

Question 15

Mass is added to the cart by the addition of a wooden block that rests on top of it. When the force is increased to 4.0 newton's, the block falls off as the cart begins to accelerate. Why does it fall off when the force is increased to this level?

Accepted Answer

The mass of the cart becomes too large, and the load must be reduced for the cart to accelerate

Answer

The force accelerating the cart becomes large enough so that the force of friction holding the block in place is overcome

Answer

The force of friction holding the block in place becomes large enough to overcome the force accelerating the cart

Answer

The acceleration becomes nonuniform with this force

Question 16

Another experiment showed the velocities for a trial to be 1.0 m/s, 2.5 m/s, 4.5 m/s, and 7.0 m/s when measured at the same time. What trend occurred in the average acceleration?

Accepted Answer

It decreased by 10.0 m/s2 each interval

Answer

It was constant

Answer

It decreased by 5.0 m/s2 each interval

Answer

It increased by 5.0 m/s2 each interval

Question 17

If Trial 3 were redone with a force of 1.0 newton, then compared to that found in Trial 3, the average acceleration would be:

Accepted Answer

Initially lower and decreasing

Answer

Initially lower and constant

Answer

The same

Answer

Initially higher but decreasing

Question 18

A student studied the relationship between the current,voltage,and resistance in a direct circuit.To obtain the results presented in Figure 1 and Table 1,the student constructed the circuit shown below.The student used 3 resistors and different amounts of voltage generate Table 1.The current was read from the ammeter.To obtain the results in Table 1,a 5-ohm resistor (Resistor 4)was used varid .The current was measured at the power was then calculated.Acocording to Figure 1, when 6V were applied to Resistor 1,the current was:

Accepted Answer

2.25amp

Answer

0.50amp

Answer

0.75amp

Answer

1.50amp

Question 19

A student studied the relationship between the current,voltage,and resistance in a direct circuit.To obtain the results presented in Figure 1 and Table 1,the student constructed the circuit shown below.The student used 3 resistors and different amounts of voltage generate Table 1.The current was read from the ammeter.To obtain the results in Table 1,a 5-ohm resistor (Resistor 4)was used varid .The current was measured at the power was then calculated.If a headlight uses 150 W and the car's battery produces 12 V, what is the current in the circuit?

Accepted Answer

1.25 amp

Answer

12.5 amp

Answer

12.00 amp

Answer

25.00 amp

Question 20

A student studied the relationship between the current,voltage,and resistance in a direct circuit.To obtain the results presented in Figure 1 and Table 1,the student constructed the circuit shown below.The student used 3 resistors and different amounts of voltage generate Table 1.The current was read from the ammeter.To obtain the results in Table 1,a 5-ohm resistor (Resistor 4)was used varid .The current was measured at the power was then calculated. If a trial had been performed using Resistor 3 and 12 V, the current would have been:

Accepted Answer

1.25 amp

Answer

1.75 amp

Answer

2.25 amp

Answer

2.80 amp

Free Scientific Reasoning MCQs with Answers