BMAT exam questions with verified answers
1 Step-up transformers are used to increase the current flowing
through transmission cables.
2 The higher the voltage in a cable, the more heat is lost by transfer to
the environment.
3 Step-down transformers are used to decrease the voltage from
transmission cables, so it can be more safely distributed.
Which of the statement(s) about the National Grid is/are correct?
Ans✓✓✓ 1- incorrect, step-up transformers increase the voltage
flowing through a cable, not the current.
2- incorrect, higher currents in a cable cause more heat loss to the
environment. Cables with higher currents have lower voltages.
3- correct.
1. An elastic extension occurs when the spring returns to its original
length when the tension is removed2. Materials with high spring
constants extend greatly when a small force is applied.3. The spring
constant is equal to the area under the force-extension graph.4. In all
cases, the elastic limit is the point on the force-extension graph outside
which Hooke's law does not apply Ans✓✓✓ only 1
Elastic extension is defined by a spring returning to its original length
when the tension is removed.Materials with a high spring constant are
stiff and so do not extend greatly when a small force is applied.The
spring constant is equal to the gradient of a force-extension graph.The
point on the force-extension graph outside which Hooke's law does not
,apply is known as the limit of proportionality. This is not necessarily
equal to the elastic limit.
Therefore, statement 1 is correct.
1.The electrolyte conducts electricity in electrolysis
2.Electrolytes can be made up of a range of free ions which are either
molten or dissolved in solution - therefore aqueous.
3.The purpose of electrolysis is to break up solid ionic compounds
Ans✓✓✓ 1 and 2 only
he electrolyte conducts electricity and electrolytes are made up of free
ions. Electrolysis is not used to break apart solid ionic compounds but
rather more commonly used to extract metals from their ores.
2 The stem cells collected from an embryo are able to differentiate into
a wider variety of specialised cells than the adult bone marrow stem
cells.3 The use of stem cell therapy to treat a medical condition can
increase the risk of a person developing cancer. Ans✓✓✓ 2- correct
Embryonic stem cells need to be able to form all tissue types of the
embryo, whereas adult bone marrow cells can only differentiate into a
narrower range of cell types.
3- correct
When stem cells are cultured for many generations, they can gain
multiple mutations. This can lead to them behaving like cancer cells.
, 3 definitions of oxidation and reduction Ans✓✓✓ Oxidation can be
definited as:
1) Gain of oxygen
2) Loss of electrons
3) Loss of hydrogen
Reduction can be defined as:
1) Loss of oxygen
2) Gain of electrons
3) Gain of hydrogen
A ball of mass 2kg is fired at a wall and the ball hits the wall at an initial
speed of 40 ms-1 and bounces back in the opposite direction at 30 ms-
1. The incidence takes 0.7s.
What is the force exerted by the wall on the ball? Ans✓✓✓ The
acceleration of the ball can be calculated using the equation
a=(v−u)t=(−30-40)0.7=−100msa=(v−u)t=(−30-40)0.7=−100ms-2. We can
then calculate the force exerted by the wall on the ball using
F=ma=2×100=200N
A spring measuring 0.1m is stretched using the weight of an object to
triple its original length. The object has a density of 2kgm-3 and a
volume of 25m3. Ans✓✓✓ We can work out the mass of the object by
multiplying its density by its volume. 2×25=50kg2×25=50kg. Thus, the
weight would equal 50×10=500N50×10=500NWe know that the
1 Step-up transformers are used to increase the current flowing
through transmission cables.
2 The higher the voltage in a cable, the more heat is lost by transfer to
the environment.
3 Step-down transformers are used to decrease the voltage from
transmission cables, so it can be more safely distributed.
Which of the statement(s) about the National Grid is/are correct?
Ans✓✓✓ 1- incorrect, step-up transformers increase the voltage
flowing through a cable, not the current.
2- incorrect, higher currents in a cable cause more heat loss to the
environment. Cables with higher currents have lower voltages.
3- correct.
1. An elastic extension occurs when the spring returns to its original
length when the tension is removed2. Materials with high spring
constants extend greatly when a small force is applied.3. The spring
constant is equal to the area under the force-extension graph.4. In all
cases, the elastic limit is the point on the force-extension graph outside
which Hooke's law does not apply Ans✓✓✓ only 1
Elastic extension is defined by a spring returning to its original length
when the tension is removed.Materials with a high spring constant are
stiff and so do not extend greatly when a small force is applied.The
spring constant is equal to the gradient of a force-extension graph.The
point on the force-extension graph outside which Hooke's law does not
,apply is known as the limit of proportionality. This is not necessarily
equal to the elastic limit.
Therefore, statement 1 is correct.
1.The electrolyte conducts electricity in electrolysis
2.Electrolytes can be made up of a range of free ions which are either
molten or dissolved in solution - therefore aqueous.
3.The purpose of electrolysis is to break up solid ionic compounds
Ans✓✓✓ 1 and 2 only
he electrolyte conducts electricity and electrolytes are made up of free
ions. Electrolysis is not used to break apart solid ionic compounds but
rather more commonly used to extract metals from their ores.
2 The stem cells collected from an embryo are able to differentiate into
a wider variety of specialised cells than the adult bone marrow stem
cells.3 The use of stem cell therapy to treat a medical condition can
increase the risk of a person developing cancer. Ans✓✓✓ 2- correct
Embryonic stem cells need to be able to form all tissue types of the
embryo, whereas adult bone marrow cells can only differentiate into a
narrower range of cell types.
3- correct
When stem cells are cultured for many generations, they can gain
multiple mutations. This can lead to them behaving like cancer cells.
, 3 definitions of oxidation and reduction Ans✓✓✓ Oxidation can be
definited as:
1) Gain of oxygen
2) Loss of electrons
3) Loss of hydrogen
Reduction can be defined as:
1) Loss of oxygen
2) Gain of electrons
3) Gain of hydrogen
A ball of mass 2kg is fired at a wall and the ball hits the wall at an initial
speed of 40 ms-1 and bounces back in the opposite direction at 30 ms-
1. The incidence takes 0.7s.
What is the force exerted by the wall on the ball? Ans✓✓✓ The
acceleration of the ball can be calculated using the equation
a=(v−u)t=(−30-40)0.7=−100msa=(v−u)t=(−30-40)0.7=−100ms-2. We can
then calculate the force exerted by the wall on the ball using
F=ma=2×100=200N
A spring measuring 0.1m is stretched using the weight of an object to
triple its original length. The object has a density of 2kgm-3 and a
volume of 25m3. Ans✓✓✓ We can work out the mass of the object by
multiplying its density by its volume. 2×25=50kg2×25=50kg. Thus, the
weight would equal 50×10=500N50×10=500NWe know that the
