Explore topic-wise InterviewSolutions in Current Affairs.

Schleiden called it the cytoblast.

(i) A charged particle travels undeviated through a magnetic field \(\vec B\), if its velocity \(\vec v\) is parallel or antiparallel to \(\vec B\). In this case, the magnetic force on the charge is zero. 

(ii) A charged particle travels in a circular path within a magnetic field \(\vec B\), if its velocity \(\vec v\) is perpendicular to \(\vec B\). 

(iii) A charged particle travels in a helical path through a magnetic field \(\vec B\), if its velocity \(\vec v\) is inclined at an angle θ to \(\vec B\), 0 < θ < 90°. In this case, the component of \(\vec v\) parallel to \(\vec B\) is unaffected by the magnetic field. The radius and pitch of the helix are determined respectively by the perpendicular and parallel components of \(\vec v\).

Data : e = 1.6 × 10^-19 C, 

v = 2 × 10⁷ m/s, 

B = 10^-3 T

The magnitude of the magnetic force,

F_m = evB (∵\(\vec v\)⊥ \(\vec B\))

= (1.6 × 10^-19 C)(2 × 10⁷ m/s) (10^-3 T)

= 3.2 × 10^-15 N = 3.2 fN

Delhi takes 4th  place for the most polluted cities in the world.

(a) Cross the road when the green light is over

(a) you will wear a helmet

Platform  tickets usage in Rail.

(a) We should walk left of the road

(c) The seat belt should be used while driving a car.

Earthworm is an annelid having ventral, ganglionated nervous system. It consists mainly of nerve ring, nerve cord and peripheral segmentally arranged nerves.

An organized collection of secretory epithelial cells capable of producing of some secretion is called a gland.

After being drunk, a driver cannot follow the road properly. So, it increases the possibility of accidents.

The reasons of air pollution are 

• Poisonous gases spread from the factories which make the air polluted
• Smoke of vehicles is another reason for air pollution
• The smoke coming from burning things, creates air pollution.

(a) We should stop if there is a red light on the intersection.

We should walk on the left side of the road.

The lateral ventricle communicates with the III ventricle in the diencephalon through an opening called interventricular foramen or foramen of Monro.

The following steps are taken to reduce the level of smoke and poisonous gases in the air 

• Grow more and more trees. 
•  Accept the concept of carpulling. 
• Use cycles instead of cars and motoreycles. 
• Immediate control on the pollution from factories

We should take following steps to reduce the air pollution 

• All the public transports should be modified so that they run with natural gas (CNG) or battery. 
• Afforested with more and more trees. 
• Poisonous gases should be reduced which comes from factories.

(i) When we pass by the front of a school, we should control our vehicle speed as well as should not blow horn continuously and loudly. 

(ii) We should wait for the students while they are crossing the school road

If there is a cross mark on the icon of a horn, then we should not blow horn frequently and loudly.

Tree is not the cause of air polluction.

There will be more air pollution in factory areas, areas with more number of vehicles and places where things are burnt.

A thin membrane which separates the lateral ventricles I and II is called the septum pellucidum.

We should help the injured person in a road accident and take him to the hospital by an ambulance.

(a) Immediately, come out of the vehicle and lift the person.

(d) You will hold his hand and help him to cross the road.

(a) We should stop

The dorsal portion of the mid brain consists of four rounded bodies called corpora quadrigemina. It acts as a reflex centre for vision and hearing.

We should slow our vehicles when driving

(i) We should follow’the traffic rules 

(ii) We should walk by the left side of the road 

(iii) While crossing red light, we should use zebra crossing 

(iv) We should control our vehicle speed on a speed breaker 

(v) We should not talk on mobile phone while driving 

(vi) We should not drink while driving 

(vii) We should wear helmets while driving two-wheelers. 

(viii) We should fasten the seat belts while driving four-wheelers.

(i) Firstly, we should give the injured person some first aid.

(ii) After that, we should call an ambulance.

(iii) We should inform the police.

(iv) If ambulance is not available, then the injured person should be taken to the nearby hospital.

(v) We should inform the relatives of the injured person.

No, there is no black colour particles on the leaves of the plants growing away from the roads because the tree is more far away from pollution.

We should stop our vehicles when there is a red light in the crossing.

A pair of small rounded body in the hypothalamus is called mammillary bodies. These are involved in olfactory reflexes and emotional response to odour.

(b) Cross the road by running.

We should purchase platform tickets to enter the railway station.The ticket checker charges a penalty from the people who does not have a platform ticket.

(c) You will phone an ambulance.

The black particle of the pollution was stuck on the leaf. So, when the leaf was rubbed on the paper, it became black or brown.

In Hydra, the nervous system is in the form of nerve net, while in earthworm and cockroach the nervous system is ganglionated.

(c) Push the vehicle immediately to bring it at one side.

The cerebral hemispheres are connected by a tract of nerve fibres called corpus callosum.

We should use the overbridge while crossing the railway tracks.

From the railway tickets, we get the information of the train number, passenger count, PNR, date of travel, ticket number, age of the passengers, sex, fare, starting station and destination station, seat number, coach number etc.

Hypothalamus is the ANS controlling centre. The Autonomic neural system innervates smooth muscles, glands and cardiac muscle.

The space between the piamater and arachnoid mater is called subarachnoid space.

On the railway stations, people sell water bottles, tea, coffee, puri-sabji, samosa, kachori, namkeen, books and magazines etc.

The limbic system is a set of components located on both side of the thalamus present in the inner part of the cerebral hemisphere. It includes the olfactory bulbs, cingulate gyrus, mammillary body, amygdala, hippocampus and hypothalamus. The limbic system plays a primary role in the regulation of pleasure, pain, anger, fear, sexual feeling,affection and memory. Hence it is called emotional brain.

The space between the duramater and arachnoid mater is called subdural space.

The warnings written and announced in the railway station are 

• Ticket is necessary for travelling in trains.
• Do not touch any unclaimed object. 
• Passengers should always take care of their belongings. 
• Smoking is prohibited in the railway station. 
• We should not use the toilets while the train is stationary. 
• Passengers should not travel on the roof of the trains. 
• Passengers should not get down from a running train.
• Passengers should be aware of pick-pockets.
• People should maintain cleanliness in the railway stations.

Brain is covered by three cranial meninges. The outer thick layer is Duramater which lines the inner surface of the cranial cavity; the median thin layer is Arachnoid mater which is separated from the duramater by a narrow subdural space. The innermost layer is Piamater which is closely adhered to the brain but separated from the arachnoid mater by the subarachnoid space.