There are many things which put effect on the price movement in the day trading.

Positive or Negative news related to that stock: The price movement in shares of any particular stocks in a day trading is depends upon the news flow.
If the news is positive like company win the order from their clients related to that company then price of that share will go up, if the news is negative then price will go down.

SGX Nifty- Opening market clue also put the effect on the price movement in the share price. If the Asian markets are trading in green then our market NSE and BSE will open green, if the Asian markets are trading in red then our market also open red as per SGX Nifty point.

Upgrade or down grade by rating agency: If there is any upgrade or downgrade by rating agencies to any stocks then there is huge impact on the stock

RBI policy: RBI Policy put good impact on the price move movement of the stock. There is big price fluctuation in the rate sensitive stocks.

Foreign Institutional Investors (FII's) buying and selling: if the FII are buying or selling the particular stocks then there is price fluctuation in the day trading.

Domestic Institutional Investors (DII's) buying or selling: Domestic Institutional Investors also put grate impact on the change in the price of stork in day trading.

Quarterly result of the stocks: if any company posted the good quarterly result then there is positive change in the price movement of the stock and if the company posted the bad quarterly result then there is you will see negative movement in the price of the stock.

Factors affecting the stocks
1.News
2.Impact of other asian markets
3.Quaterly results
4.Fundamental news
5.Inflation rate
6.Future/derivative expiry
7.Where to watch the movement of stock

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The stocks may rise or fall due to numerous reasons, some of them are mentioned below. If you at least keep a watch on following factors. You can save yourself been big loss (if stocks are falling) or earn good amount (if stocks are rising).

A) News

Stock market always reacts for appropriate news. Always read financial news like Business Standard and Economics Times etc. or else watch financial news channels.

What is appropriate news?
News - Like merger announcement, this news will impact more if the merger is related to foreign company, positive news - stocks may rise.
Demerger announcement will have negative impact - negative news - stocks may fall Merger and Demerger announcement may have major impact on Indian Stock Market.

Acquisition (takeover) Announcement - Takeover of some part (or whole) of companies, especially those having larger capacity/turnover or foreign company’s. This news will have major impact on that particular stock - very positive news - stocks may rise, don’t miss this opportunity. Buy stocks of such companies. Takeover may have positive impact on Indian Stocks.

Expansion Plan - Announcement like major expansion plan of a company or entering into other sectors or opening new plants, branches, turnover increase announcement, new              product launch etc. Above announcement will have a positive impact on a stock market - stock may rise.

Political News - News like elections in the country or in any particular state, news of any major change in political upfront or in any change in rules will also have major impact on Indian stock market.
Political news related to any particular State will have major impact on companies located in that state for example major Sugar Companies are located at Uttar Pradesh like Balrampur Chinni, Triveni Engg, Bajaj Hindustan etc. so any major political news especially related to any sector will have major impact on stocks of that sector.

Sector News - The stocks of Indian stock market have different sectors and if any announcement of news by Government for any particular sector will have major impact on stocks of that sector.
Following are few sectors, few companies and few related news that may affect stock prices in Indian Stock Market
Sector Companies News Announcement
Banking - ICICI, SBI, UTI, Indian Bank etcHike or decrease in interest rates, loan rates etc.
Oil - IPCL, BPCL etcHike or decrease in diesel prices, hike or decrease in crude oil prices etc.
Retail - Dabur, ITC, etc News related to any taxes etc.
Cement - Indian Cement, Gujambcem etc Hike or decrease in cement prices.

B) Impact of Other Asian Market

Most of the time it has been observed and studied that Indian Market (Nifty/Sensex) follows other Asian markets and USA markets.
Asian markets like China - Shanghai’s market, Japan - Nikkei market, Hong Kong - Hang Sung market.
Above all Asian markets “open” early than Indian market. Most of the time Indian market will follow this Asian markets.
If these Asian markets open in positive and lead to positive direction than the Indian markets will react in the same manner and vice-versa provided that there is no major news in India.
USA market - USA markets like NASDAQ and DOW will also have major impact on Indian market.
So, in short in the morning around 9.30 am (Indian market opens at 9.30 am) get all news above USA markets (which opens and closes in our night time which is their day time) and Asian markets and plan yours day trading.
Individual stock - If the stock is over bought, then some profit taking will takes place ( price may come down) and if stock is over sold then you may see some buying (price may go up) of those stocks with large volumes, than you can plan your trades accordingly.

C) Quarterly Results - (Very important)

Quarterly results declared by all Indian Companies will have major impact on that company and hence their stocks in Indian stock market. Every company declares its quarterly results. If any company declares extra-ordinary results that will definitely affects its stocks. Most of all stock traders concentrate on much profit and target sales that company had made. If company achieved good profit than they declare dividend, bonus stocks etc. This will make positive impact on stocks of that company.

D) Fundamental News

Fundamental news means companies own news. Companies own news means future turnover announcements, any change in director body, future releases etc. If the company has good fundamentals like board of directors, companies expansion plans, future acquisition etc then its worth to invest in such companies for long term.

E) Inflation Rate - (Very important)

Inflation rate is wholesale prices of consumer goods. This rate is declared by Government for every week at Friday (weekend) 12.00 pm. The inflation rate indicates what the wholesale price was for that week. If it is low
As compared to previous week, then it is positive news and you may see stock prices going up and if the rate is higher as compared to previous week, then it is negative and this may affect stock prices negatively and stock prices may come down.
So keep a watch. Inflation rate declare by Indian Government at every Friday 12.00 pm and trade accordingly.
“Indian stock market reacts to inflation rate”.

F) Future/Derivative Expiry - (Very important)

Future/Derivatives has expiry period of one month. Derivatives get expired on last Thursday of a month. Future/Derivative gets expired means you have to sell your future/derivatives which you carry for whole month and buy for next month. Due to this expiry period stock traders sell there derivatives, due to which stocks prices may come down.
If you watch the stock market carefully this selling movement starts before one or two days of expiry. So be cautious and plan your trade accordingly.
During this expiry period you may see stocks prices coming down then you can plan your buying and selling in next month when prices go up.

G) Where to Keep Watch - (for day traders)

Keep a close watch on stocks which comes under top gainers, top losers and which are touching all time high. What can be done in after market hours (when market closes at 3.30 pm) you can make a list of all those stocks then plan your trade.
“Touching all time high is positive news.”