BMAT 2005-S2

The movement of air in and out of the lungs can be measured using a spirometer. The graph is a trace from a spirometer.

You are told that three different gas jars contain carbon dioxide, hydrogen and oxygen respectively.

One type of fission of gives   and   as the main products.

Four 1000 Ω resistors are connected as shown in the following circuit.

Two of the resistors are changed to 900 Ω.

Smoking cigarettes can lead to emphysema. This occurs because:

Using the formula:

z = xy ²

calculate the value of y when:

z = 1.2 x 10¹³

x = 3.0 x 10^–6

During metabolism, two molecules of pyruvic acid, C₃H₄O_3, are formed from one molecule of glucose, C₆H₁₂O₆.

The length of a person’s eyelashes is controlled by a single gene. The diagram shows the inheritance of this feature in a family.

Two variables are connected by the relation: A µ 1/B².

B is increased by 40%.

A uniform beam of length 60 cm weighs 10 N. Its centre of gravity (the point where its weight can be assumed to act) is at its centre. A weight of 800 N rests at one end of the beam as shown, and the beam is balanced by another weight of 200 N placed at distance x from the pivot.

Which fraction is the percentage by mass of water of crystallisation in sodium carbonate decahydrate?

(Relative atomic masses, A_r: Na=23; C=12; O=16; H=1)

Which row of the table shows what occurs in the eye when you watch a bird flying away from you?

Rearrange the following equation to give x in terms of y.

A pulse of frequency 100 kHz is emitted from an ultrasound scanner, and is reflected from a fetus 10 cm below the transmitter placed on the mother’s abdomen. The speed of sound within the mother’s body is 500 m/s.

The reaction between nitrogen and hydrogen to form ammonia is exothermic.

N₂ + 3H₂ → 2NH₃       ∆H -ve

The strengths of the bonds in the three molecules are as shown.

N ≡ N         x kJ

H − H         y kJ

N − H  z kJ

The diagram shows three sections, separated by hinge-like joints, of the leg of a crab with an exoskeleton.

i. A part that acts in a similar way to a tendon.

ii. A part that has a role that is similar to that of a ligament.

iii. A muscle that is antagonistic to B.

Evaluate

(√5 – √2)² (√5 + √2)²

A sample of rock contains ²³⁵U and ²⁰⁷Pb in the proportion one part ²³⁵U to seven parts ²⁰⁷Pb. It is known that ²³⁵U decays to ²⁰⁷Pb with a half life of 7.1 × 10⁸ years.

A sample of an acid, H₂X, weighing 4.5 g was dissolved in water.

This solution was neutralised by 50.0 cm³ of aqueous sodium hydroxide containing 2 mol/dm³.

H₂X(aq) + 2NaOH(aq) → Na₂X + 2H₂O

The table shows the concentrations, in arbitrary units, of four substances. These substances are present in each of two animal cells, K and L, whose cell membranes are in contact.

In the shape shown below, A, B and C are the vertices of an equilateral triangle, side length x The arc AC forms a semicircle.

When a 1 kg mass is dropped from the top of a building 20 m high it hits the Earth with a speed of 20 m/s.

A sample of butane, C₄H₁₀ is treated with deuterium, D (an isotope of hydrogen) and some of the hydrogen atoms are replaced by deuterium atoms.

Analysis shows that the substituted butane contains 80.0% of carbon by mass.

During the fetal stage an opening, the foramen ovale, exists in the septum between the two This allows blood to flow from the right atrium to the left atrium.

A heart exerts a maximum (systolic) pressure of 152 mm Hg. This pressure is applied to an aorta of cross sectional area 2.0 cm².

Which of the following thermal decomposition reactions will require the highest temperature?

A circle has a diameter of 20 cm.

The line AC is a diameter of the circle.

B is a point on the circumference of the circle with AB = 12 cm.

The point D lies on the arc AC on the opposite side to point B.